A
Because 8x - 2y = 24 is equal to -2y = -8x + 24 is equal to y = 4x - 12.
-2x+2y=6
7x-8y=-27
5x-6y=-21
-x+y=3
6x-7y=-24
6x-7y=-4(-2x+2y)
6x-7y=8x-8y
-6x from both sides:
-7y=2x-8y
add 8y to both sides:
y=2x
-2x+2y=6
2y-6=2x
2y-6=-12
-6-6=-12
y=-3
x=-6
Hope this helps :)
Answer: −10
Step-by-step explanation: 9^2−21/−6
81−21/−6
60/−6
−10