Solve for - 2x - 5y = - 20 and 2x + y = 4

Asked by AnneS2 on 14 Jul 08:55

Last updated by anonymous on 15 Jul 13:33

Answered by CherieS on 15 Jul 13:33

2x + y = 4

2x -2x+ y = 4-2x

y = 4-2x

- 2x - 5y = - 20

- 2x - 5(4-2x) = - 20

- 2x - 5(4) (-5)(-2x) = - 20

- 2x - 20+10x= - 20

- 20+8x= - 20

- 20+8x+20= - 20+20

8x=0

8x/8=0/8

x=0

y = 4-2x

y = 4-2(0)

y = 4-0=4