a = b - 7000
0.05a + 0.07b = 1690
Since we have a "value" for a, we can substitute that "value" in place of a.
0.05(b - 7000) + 0.07b = 1690
0.05b - 350 + 0.07b = 1690
0.12b = 2040
b = $17,000
Mike J.
asked 08/19/18
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