use a calculator to solve each equation:
-5.5x + 0.56 = -1.64
-4.2x + 31.5 = -65.1
k/5.2 +81.9 =47.2
-5.5x + 0.56 = -1.64
-4.2x + 31.5 = -65.1
k/5.2 +81.9 =47.2