### Home > INT3 > Chapter 12 > Lesson 12.1.2 > Problem 12-28

12-28.

Solve the system of equations below. What subproblems did you need to solve? Homework Help ✎

*x*+ 2*y*= 4

2*x*−*y*= −7

*x*+*y*+*z*= −4

Use the first two equations to solve for *x* and *y* using the Elimination Method.

−2(*x* + 2*y*) = −2(4)

2*x* − *y* = −7

Now that you know *x* and *y*, how can you find *z*?

*x* = −2, *y* = 3, *z* = −5