Question 728220
You should write a system of equations to solve the problem:
x+y=19
3x+4y=60
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-3(x+y=19) becomes -3x-3y=-57
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-3x-3y=-57
3x+4y=60
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y=3
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Put y back into an equation:
x+y=19
x+3=19
x=16