Question

Solve the system of equations.
2x-y =7
1x-y = 10

Answer 1

(-3, -7)

Explanation:

2x - y = 7 multiply by -1 ⇔ -2x + y = -7

1x - y = 10 Do not change ⇔ 1x - y = 10

-x = 3

x = -3

Use the second equation to solve on y when x = -3

-1x - y = 10

-1(-3) - y = 10

3 - y = 10

-y = 10 - 3

-y = 7

y = -7 Solution: (-3, -7)