Allen S. answered • 01/06/15

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What do we know?

Total purchases = 136.40

purchase 1 = x

purchase 2 = x - 9.50

Write the equation:

136.40 = x + x - 9.50

Simplify:

136.40 = 2x - 9.50

136.40 + 9.50 = 2x

145.90 = 2x

72.95 = x

x = 72.95 (purchase 1)

72.95 - 9.50 = 63.45 (purchase 2)

72.95 + 63.45 = 136.40 (check for truth)