answer 4x-5y=20 what does x and y equal?
470599
i think you need another equation...this equation represents a straight line that crosses the y axis at -4, and the x axis at 5, so you have an infinite number of points along that line, that can fit into this equation. To find out what x an y equal, you need another equation that gives you a point of intersection. Once you have the equation you can resolve the value of x and y by first isolating the x in one equation , for example in this case, x=5y/4 +5, and replacing the x value in the second equation with 5y/4+5. then you'll just have y's and be able to resolve. then when you get the value of y, replace the y in the first equation with it, you'll just have an x to resolve.
850518
5 x _ - 28 = 12 + 3 x _\n\nLet the first blank be Y and th second blank be X\n\nThen 5Y - 28 = 12 + 3X\nie 5Y = 3X + 40\nie Y = 3/5 X + 8\n\nSo ANY ordered pair on this line will obey the rule\n\nEg when X = 5 Y = 11\n\nWhen X = 20 Y = 20\n\nWhen X = - 15 Y = -1\n\nThe solutions are infinite in number but all obey the set rule that the first blank = 3/5 of second blank + 8
720107
4x -12y =5...........(1)\n-x +3y = -1..........(2)\n\nMultiplying eq.(2) by 4 and add with eq.(1)\n(4x -12y =5) + (-4x +12y = -4)=\n0 = 1\nwhich is invalid.
386537
4y=3x\ny=3x/4\ny=3/4 x\n\nGet it?
785524
y = 3x-5\n\nx^2 +(3x-5)^2 = 25\nx^2 + 9x^2 -30x + 25 = 25\n10x^2 -30x = 0\n10x(x-3) = 0\n\nso x = 0 or x = 3\n\nWhen x = 0 y = -5\n\nWhen x = 3  y = 4
709836
2x -  4y = -5\n3x + 4y = -15\n\n5x = -20\n\nx = -20/5                                       \n\nx = -4\n\n*************************\n\n2(-4) - 4y = -5\n\n-8 - 4y = -5\n\n- 4y = -5 + 8\n\n- 4y = 3              \n\ny = -3/4\n\n**************************\n2 (-4) - 4 (-3/4) = -5                                        \n\n-8 - (-3) = -5           \n\n&\n\n3 (-4) + 4 (-3/4) = -15                           \n\n-12 + (-3) = -15
753426
X2   5x - 4y = 1\n10x -8y =2\n-10x + 8y = -3\n-------------------------\n  0=-1                NO SOLUTION
679397
y = 0.5x-4 \n\nor similarly\n\nx= 2y +8
735951
(x/4) +5 = (x/2) +1  is the equation if I understand you correctly.\n\nfirst, multiply both sides by 4 to get rid of the fraction on the left side, and it will also remove the fraction on the right side:\nx + 20 = 2x + 4\n\nnow you want to move all the variables to one side and the numbers to the other.  Do this by subtracting x from both sides and subtract 4 from both sides:\nx - x + 20 - 4 = 2x - x + 4 - 4\n(see how they will cancel and "move" to the other side)\n16 = x\n\nx = 16
152532
y = 4x - 3 and y = 5x - 1, so\n4x - 3 = 5x - 1 (I substituted the value of y in the first eq'n to the second eq'n)\n-x = 2\nx = -2\ny = 4(-2) - 3\ny = -8 - 3\ny = -11\n;-)
1009010
y= 40-5x\ny=40-5(6)\ny=10\n10
555213
x^2 - 20 = 0\nx^2 = 20\nx = ±sqrt(20)\nx = ±sqrt(4 * 5)\nx = ±2sqrt(5)
963450
20 + x = -4x + 15\n5x = -5\nx = -1\n\n5 = 5(x - 1) + 3 - 4x\n5 = 5x - 5 + 3 - 4x\n5 = x - 2\nx = 3\n\n-5 + 6 - 8x = -150\n5 - 6 + 8x = 150\n-1 + 8x = 150\n8x = 149\nx = 149/8
260457
20 - - 4 = 24\nminus and minus = plus\nie\n20 - - 4 = 20 + 4 = 24
792279
25a^2-20a+4\n= 25a^2-10a-10a+4\n=5a(5a-2)-2(5a-2)\n= (5a-2)(5a-2)Ans.
2156
5x+9y=18\nsubtract 5x from both sides because you want Y by itself\n\n9y=18-5x\ndivide both sides by 9 because you want Y by itself\n\ny=2-5/9x<---------------There you have it, simplified
264673
Let x = # of 20's\ny = # of 50's\n\nx + y = 32\n20x + 50y = 1000 or\n2x + 5y = 100\n\nfrom the first equation, we know that x = 32 - y. Simply substitute this to the remaining equation and solve for the value of y.\n\n2(32 - y) + 5y = 100\n64 - 2y + 5y = 100\n3y = 36\ny = 12\n\nThe answer is 12 ^_^