what does x-coordinate mean
214885
on a graph every point has an x and y coordinate.  The vertical(up-down) is the Y-coordinate, the horizontal (left-right) is the x-coordinate
504959
Correlation! (Maybe... well the 6th letter is L at least).\n\nCorrelation basically describes the strength and direction of the (linear only) relationship between two variables or sets of observations. \n\nIt's a number between -1 and 1, and is denoted by 'r' or the Greek letter 'rho' (it looks like a 'p').  E.g. r = 0.87 \n\nI hope that's the kind of statistical symbols the crossword clue is referring to. \n\nGood luck with the crossword!
368726
a). If it touches the x-axis, then y is zero.  \nSo x^2 + 0 + 0 = 7\n\nx^2 = 7\n\nx = sqrt 7 or - sqrt 7  \n\nThe points are (sqrt 7, 0) and (-sqrt 7, 0)\n\nb).  Differentiate implicitly like this:\n\nd/dx x^2 + d/dx xy + d/dx y^2 = d/dx 7\n\n2x + (x dy/dx + y) + 2y dy/dx = 0\n\nx dy/dx + 2y dy/dx = -2x - y\n\ndy/dx (x+2y) = -2x - y\n\ndy/dx = (-2x-y)/(x+2y)\n\nc,d).  Just plug in the coordinates from (1)
610822
Let as suppose that your ellipse is rotated by 45 degrees to right (or by -45 degrees). The new coordinates are X = x cos (-45) - y sin (-45) and Y = x sin (-45) + y cos (-45) and they are satisfying X^2/a^2 + Y^2/b^2=1. There for (x + y)^2/2a^2 + (x - y)^2/2b^2 = 1 (in a few easy steps). The mayor axis over the x=y is given by |a| > |b| .
132061
You are usually given a point to plot.  The point is written as (-4, 2).  The first number represents x and the second represents y such as (x,y)\n\nTo plot the point, you start at the origin (middle) which is (0,0)\n\nThe x-axis is the horizontal line that goes left and right.  You put your pencil on the origin *but don't make any marks*\n\nLook at the first number in the ordered pair (-4,2)\nIt's -4.   You move across to -4 (on the x-axis...the horizontal line) and stop your pencil there but don't make a mark.\n\nThen look at the second number (-4,2) and you see it's 2.  Since 2 is positive you move up to spaces and then plot your point.  If it was negative, you would move down that number of spaces on the y-axis (vertical line).\n\nHope this helps.  Plotting points is fun.
370422
In mathematics, the Cartesian coordinate system is used to uniquely determine each point in the plane through two numbers, usually called the x-coordinate and the y-coordinate of the point. To define the coordinates, two perpendicular directed lines (the x-axis or abscissa and the y-axis or ordinate), are specified, as well as the unit length, which is marked off on the two axes (see Figure 1). Cartesian coordinate systems are also used in space (where three coordinates are used) and in higher dimensions.\n\nUsing the Cartesian coordinate system geometric shapes (such as curves) can be described by algebraic equations, namely equations satisfied by the coordinates of the points lying on the shape. For example, the circle of radius 2 may be described by the equation x² + y² = 4
362985
x^2 - 5x > 0 means x(x - 5) > 0.\n\nThus, we obtain two inequalities: \n(a) x > 0 and \n(b) x - 5 > 0.\n\nObserve that from these two inequalities, we have two critical numbers that will make the left-hand side of (a) and (b) to be either 0 or undefined. These are x = 0 for (a); and x = 5 for (b).\n\nFrom these critical numbers, we split the real line into the following open intervals:\n(–∞, 0), (0, 5) and (5, ∞). \n\nNext, we check the behavior (in terms of signs) of the left-hand side of the inequalities (including the given inequality) together with the open intervals and critical numbers. \n\nIntervals       x        x – 5       x(x – 5)\n(–∞, 0)       –                   –                    +\nx = 0         0                    –                    0 \n(0, 5)         +                   –                    –\nx = 5         +                   0                    0\n(5, ∞)         +                   +                    +\n\nNOTE: Consider the open interval (0, 5). If we pick x on this interval, say x = 1. Then obviously on the x column, x = 1, so the sign of x is +, since 1 > 0. But on the x - 5 column, we have 1 - 5 = –4. So the sign on this column is – since –4 < 0. Thus, we take the product of these signs, i.e. (+)(–) = – that we will mark on the x(x – 5) column.\n\nNotice that on the rightmost column ( for x(x – 5) ), we took the product of the signs located on the second and third column that are produced by the corresponding interval in the leftmost column. Since we want x(x – 5) > 0; i.e., the sign for x(x – 5) will yield +, we observe from the table that any value of x in the open intervals (–∞, 0) or (5, ∞) yields a + sign in the x(x – 5) column. Hence, the solution for this inequality must be the set\n{x | x is in the interval (–∞, 0) or (5, ∞)}.
421789
This is a two-part function.  Its graph consists of two rays (arrows).  On the left side of the graph you will have a ray (part of a line) that starts at -1 on the y-axis and goes up and to the left with a slope of -1.  On the right side is another ray that starts at 1 on the y-axis and goes up and to the right with a slope of 1.  The way you have the function written here both rays would have circles at the end, because the endpoints are NOT included in either.  There's a good chance that in the actual problem one or the other has the < or > symbol underlined to indicate "or equal to".  If it is, you'd fill in the circle to show the point on the y-axis is included.
538041
In the cartesian coordinate system:\n1) the "x" coordianate is horizontal with positive numbers being on the right and negative numbers being to the left of the origin (0,0)\n2) the "y" coordinate is vertical with positive numbers being above and negative numbers being below the origin.\n\nExample:  the point (3,5) is 3 units left of zero and 5 units above zero.\n\nSince these are linear equation, you can just try some sample values for x or y (whichever is easier) and calculate the other.  With two or three points you should be able to graph the line for the equation given.\n\nFor the first equation  2y=5x-1 I got the following points:\n(1,2) (2,4.5) and ( 3,4)\n\nFor the second:  x=y+2 I got:\n(3,1) (4,2) and (5,3)\n\nSince these are linear equations you can plot the points and draw a line to connect them.  If you're supposed to find where they intersect, plot them on the same graph and extend the lines until they intersect. (You can calculate more points to help you do this.)  Then determine the point of intersection.  There are other ways to do this but it says to solve them graphically.\n\nHope this helps.
129107
x can be any value.\n\ntan x = sin x / cos x\n\ncot x = cos x / sin x\n\nso tan x * cot x = sin x/cos x * cos x/sin x\n\nsin x's cross out each other\n\ncos x's cross out each other\n\nso you're left with 1.
392958
it means that as a (linear) transformation from the plane to the plane it reverses the orientation.\nthe way we calculate the area, is really a signed area, in the sense that it takes into consideration the orientation of the 2 vectors.\nit is a bit subtle and that is why most teachers do not really explain it.\n'
291703
considering both y values are -2 for A and C....\n\nwe know that a straight line exists between these two points, which means that it HAS to be 1 of the 4 sides.\n\ngiven that, the coordinates or K and L HAVE to be (3, infinity (EXCEPT -2)) and (-4, infinity (EXCEPT -2))
636870
Domain = all x-values included in the function\nRange = all y-values included in the function\n\nBoth will be written as an inequality.  Here's an example:\n\ny = square root(x-3) + 2\n\nGraph this equation on your calucluator or sketch a graph by hand by plugging in x coordinates starting with 3.  The vertex of this graph is at (3, 2).  Therefore, the domain is:\n\nx is greater than or equal to 3\n\nThe range is:\n\ny is greater than or equal to 2.\n\nIt really helps to visualize the problem when doing these problems.\n\nGood luck!
623824
Negative x value, because its a two dimensional grid so theres no third value. Y value will be unknowns since you dont give any info with respect to the y value. I believe this is correct.
481043
y=1 is a straight line parallel to x axis\nx=(-1/4) is a straight line parallel to y axis
109996
|x| is the absolute value of x, which is was | | represents. The absolute value of a number is ALWAYS positive. So, look at the problem, and see what number would fit into the equation. The solutions would be that number, and that number in negeative form, because the absolute value of a number is always positive.
365900
2points answer.\n\nTry again.  Your question is unreadable.\n\nDon't use x as both a variable and an operator.  On that first one, which side of the multiplication is the variable x on?\n\nI don't understand what the third one is trying to say at all.\n\nUse * for multiplication, use / for division.\n\nAnd most importantly, what answer do you want from this?  You aren't showing any equalities or inequalities.  The second one shows five variables, so there aren't enough expressions to solve them anyway.