CPM Homework Banner

Home > CC4 > Chapter 8 > Lesson 8.1.2 > Problem 8-31

8-31.
  1. Solve each system of equations using the method of your choice. Homework Help ✎

  2. a.

    y + x = −2
    5x − 3y = 22

    b.

    x = 3
    7x − 2y = 24

Read Math Notes box in Lesson 6.3.3 on the Elimination Method.

Try rearranging the first equation and then using the Elimination method.

Rearrange the first equation so that x is first. Multiply the top equation by 3 to eliminate y. Add the two equations to solve for x.

Substitute the x-value into either original equations to find y.

x = 2
y = −4

The first equation is already x = 3.
Use it to solve for y.

Substitute x = 3 into the second equation and solve for y.