SOLUTION: In the following system of equations, what does x equal? 8x - 8y = 16 4x + 4y = -72

Algebra ->  Coordinate Systems and Linear Equations -> SOLUTION: In the following system of equations, what does x equal? 8x - 8y = 16 4x + 4y = -72       Log On


   

Question 415775: In the following system of equations, what does x equal?
8x - 8y = 16
4x + 4y = -72

Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!


Hi

solving System by Elimination

8x - 8y = 16

4x + 4y = -72 



8x - 8y = 16

8x + 8y = -144

  16x = -128

    x = -8   and y = -10     |(-72-(-32))/4 = -40/4   |using 2nd Eq



CHECKING our Answer***

  8x - 8y = 16

 -64 + 80 = 16