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Home > CCA > Chapter 4 > 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.

    2x + 3y = 9
    3x − 3y = 6
    5x = 15

    After 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