Posted by **Ryan** on Friday, November 4, 2011 at 7:16pm.

The measures of two of the sides of an equilateral triangle are 3x + 15 in. and 7x – 5 in. What is the measure of the third side in inches?

- triangles -
**Ms. Sue**, Friday, November 4, 2011 at 7:24pm
3x + 15 = 7x - 5

20 = 4x

5 = x

- triangles -
**Steve**, Saturday, November 5, 2011 at 5:45pm
Ya gotta watch out for Ms. Sue; she's a sly one. Notice how she solved for x, but she left it up to to actually answer the question!

:-)

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