Question

Solve using the substitution method.

x + 2y = 9

x + 3y = 13



(1, 4)

Answer 1

x = 1, y = 4

Explanation:

This is very simple

Since you have 2 equations with the same coefficient of x, just minus one equation from another:

x + 3y = 13

-

x + 2y = 9

1y = 4

Sub y = 4 into any of the 2 equation,

x + 3(4) = 13

x + 12 = 13

x = 13 - 12

= 1