Question

When solving the system of equations, x + 2y = 15 which expression could be substituted 5x + y = 21for x in the second equation?

Answer 1

Step-by-stepx + 2y = 15

x = 15-2y; so substitute 15-2y for x in the second equation.

Answer 2

15 - 2y

Explanation:

x + 2y = 15

5x + y = 21

Solve the first equation for x.

x = 15 - 2y