SOLUTION: Please show me how to solve this pre algebra equation.Mark and Bill have a combined weight of 170 pounds.mark weighs 40 pounds less than twice Bill's weight.how much does each boy

Question 939062: Please show me how to solve this pre algebra equation.Mark and Bill have a combined weight of 170 pounds.mark weighs 40 pounds less than twice Bill's weight.how much does each boy weigh.
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Mark and Bill have a combined weight of 170 pounds.mark weighs 40 pounds less than twice Bill's weight.how much does each boy weigh.
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Equations:
m + b = 170 lb
m = 2b-40
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Substitute for "m" and solve for "b"::
2b-40 + b = 170
3b = 210
b = 70 (Bill's weight)
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Solve for "m"::
m + b = 170
m + 70 = 170
m = 100 (Mark's weight)
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Cheers,
Stan H.
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