Question 504280
x = one number
y = another number
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x + y = 20
x = 20 - y
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6y - 2x = 48
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6y -2(20 -y) = 48
6y - 40 +2y = 48
8y -40 = 48
8y = 88
y = 11
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substitute
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x = 20-y
x = 9
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Always check the solution.
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6(11) -2(9) = ?
66 -18 = 48
Correct.
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Answer:  The two numbers are 9 and 11.
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Done.