Solve the system of equations.

- 5x + 2y = 9

Y = 78

=

x = - 147/5, y = 78

Step-by-step explanation:

- 5x + 2y = 9

Y = 78

Substitute the second equation into the first

-5x + 2 (78) = 9

-5x + 156 = 9

Subtract 156 from each side

-5x+156-156 = 9-156

-5x = 147

Divide each side by - 5

-5x/-5 = 147/-5

x = - 147/5

x = 147/5 and y = 78

Step-by-step explanation:

First solve by substitution and put 78 into y in - 5x + 2y = 9 so you get 147/5

then plug 147/5 into x and find y