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December 19, 2014

December 19, 2014

Posted by **Jay** on Wednesday, February 15, 2012 at 8:09pm.

- algebra -
**PsyDAG**, Thursday, February 16, 2012 at 9:32pmLet x = # nickels and y = # dimes

x = 76 - y

5x + 10y = 555

Substitute 76-y for x in second equation and solve for y. Insert that value into the first equation and solve for x. Check by inserting both values into the second equation.

- algebra -
**Brian S.**, Sunday, February 19, 2012 at 11:38amAgree with this solution.

Worth pointing out that x = 76 - y originates from the formula x + y = 76. In case Jay / anyone else can't seem to get that far when solving similar problems on their own.

5x + 10y = 555 because a nickel is worth 5 cents and dime is worth 10, for a total of 555 cents. When doing these in school I would sometimes assign a variable like n and d so I'd never forget what a variable represents or accidentally get them switched around in my answer.

This also carries over nicely when solving problems like these in computer programming.

Good stuff PsyDAG

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