### Home > A2C > Chapter 2 > Lesson 2.1.2 > Problem 2-25

2-25.

Substitute 3*x* + 1 for *y* in the second equation.

*x* + 2(3*x* + 1) = −5

(−1, −2)

Multiply the entire second equation by −2.

−2*x* + 4*y* = −2

Add the equations together.

Solve for *x*.

*x* = 3

(3, 1)