Solve the system by substitution. -Y = x -7x – 5y = –20

Question

asked Mar 14, 2021 153k views

1 Answer

Sean Chou · Answer 1 · 2021-03-20T03:43:09+0000

Answer:

$x=10\\y=-10\\$

(10,-10)

Explanation:

-y=x

-7x-5y=-20

Substitute
for
in the second equation:

-7(-y)-5y=-20

Multiply:

7y-5y=-20

Combine like terms:

2y=-20

Divide both sides of the equation by the coefficient of
, which is
:

y=-10

Now, substitute
for
in the first equation:

-(-10)=x

Multiply:

x=10