07-11-2016
Mathematics

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A first number plus twice a second number is 11. Twice the first number plus the second totals 31 find the numbers

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07-11-2016

x + 2y = 11
2x + y = 31

x = 11 - 2y

2(11 - 2y) + y = 31
22 - 4y + y = 31
3y = - 9
y = - 3

x = 11 - 2(-3)
x = 11 + 6
x = 17

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