SOLUTION: Twice the sum of jerry and David’s age is equivalent to ten years less than three times franks age. David is 9 Year’s younger than jerry and frank is 5 Year’s older than jerry. Wri

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Question 1104545: Twice the sum of jerry and David’s age is equivalent to ten years less than three times franks age. David is 9 Year’s younger than jerry and frank is 5 Year’s older than jerry. Write and solve an algebraic equation to find the ages of all the men.
Answer by josgarithmetic(39620) About Me  (Show Source):
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Assign variables and translate the description into equations literally. Solve the system of equations.

j, Jerry
d, David
f, Frank

system%282%28j%2Bd%29=-10%2B3f%2Cd=j-9%2Cf=j%2B5%29

Check how the description corresponds to the equations.

Before trying to solve, notice very carefully how d is a formula in terms of j and that f is a formula in terms of j. This will allow a substitution to give you one equation in one unknown variable, j.