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Greeley [361]
3 years ago
15

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

Mathematics
1 answer:
GaryK [48]3 years ago
5 0

Answer:

x=10\\y=-10\\

(10,-10)

Step-by-step explanation:

-y=x

-7x-5y=-20

Substitute -y for x 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 y, which is 2:

y=-10

Now, substitute -10 for y in the first equation:

-(-10)=x

Multiply:

x=10

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