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July 23, 2014

July 23, 2014

Posted by **Mari** on Thursday, January 19, 2012 at 11:16pm.

~Please provide an explanation as well.

Please and thanks!

- Math, help needed -
**PsyDAG**, Friday, January 20, 2012 at 10:31am3C + D = 20

D = 20-3C

2C + 2D = 22

Substitute 20-3C for D in second equation and solve for C. Insert that value into the first equation and solve for D. Check by inserting both values into the second equation.

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