SOLUTION: The perimeter of a parallelogram is 31 meters. The length is 7a and the width is ­12 + 10a. Find a.

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Question 964310: The perimeter of a parallelogram is 31 meters. The length is 7a and the width is ­12 + 10a. Find a.
Answer by EdenWolf(517) About Me  (Show Source):
You can put this solution on YOUR website!
The equation for the perimeter is 2a%2B2b=P, so plug in what you know into the equation.
2%287a%29%2B2%2810a%2B12%29=31
Now solve for a.
14a%2B20a%2B24=31
34a%2B24=31
34a=7
a=%287%2F34%29