Yvette D.

asked • 08/30/18

Isosceles triangle - algerbra 1

The length of one of the equal sides is (15x-4) inches. The length of the non-equal side is (3x+2) inches. If the perimeter of the triangle is (40x-41) inches, find the numerical values of x, the length of all three sides and the perimeter.

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David W. answered • 08/30/18

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2(15x - 4) + 3x + 2 = 40x - 41
30x - 8 + 3x + 2 = 40x - 41
33x - 6 = 40x - 41
-7x = -35
x = 5
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Yvette D.

what formula or equation do i use to determine the length of each side? 
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08/30/18

David W.

tutor
You are given the expressions for each. Substitute 3 for x, ie 15(3) - 4.
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08/30/18

David W.

tutor
Oops x = 5, not 3.
 
15(5) - 4 is the length of two of your sides.
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08/30/18

Yvette D.

Ok I think I got it. Thanks for your help, I'm a little out of touch and I'm trying to refresh in order to assist my child.
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08/30/18

Yvette D.

so the lengths of the equal sides are 71 and the non equal side is 17 which makes the perimeter 159. Ty
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08/30/18

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