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Let the two numbers be A and B. Then...
Rewrite the first equation as:
and substitute for a in the second equation.
Rewrite as a quadratic equation in standard form.
Apply the quadratic formula:
(x is really B, one of the two numbers). In this problem, from the quadratic equation, a = -1, b = 9, and c = -20.
The two numbers are 4 and 5.