### Home > CCA > Chapter Ch4 > Lesson 4.2.4 > Problem 4-71

4-71.

Solve these systems of equations using any method. Check each solution, if possible. Homework Help ✎

One strategy to solve this system of equations is to multiply the bottom equation by −1 so you can eliminate.

2

*x*+ 3*y*= 9

3*x*− 3*y*= 6

5*x*= 15After finding

*x*, plug in its value into one of the equations to find the value of*y*.*x*= 3*y*= 1

Because one of the equations above is already solved for

*x*, one strategy to solve this system is to substitute the first equation in for*x*in the second equation.

Use the Equal Values Method.

Refer to part (a).

*x*= −4;*y*= 5