Solve system of linear equations by substitution - 2x+9y=15

x+7=4

x = - 3. | y = 1. | (-3,1)

Step-by-step explanation:

-2x+9y=15

x+7=4

-7. - 7

x = - 3

-2 (-3) + 9y = 15

6 + 9y = 15

-6. - 6

9y = 9

:9. : 9

y = 1

1

Step-by-step explanation:

-2x+9y=15

x+7=4

Solve for X.

x + 7=4

-7. - 7

x = - 3

Plug in X into the first equation

-2 (-3) + 9y = 15

6 + 9y = 15

-6. - 6

9y = 9

Divide by 9 on both sides

9/9=1