Question 488139: Express the perimeter of an isosceles triangle with side lengths x, 5x, and 5x as a function of the side length.
Answer by cleomenius(959)   (Show Source):
You can put this solution on YOUR website! I don't think the question came out as you intended, The way you have put this you need a constant that relates the two congruent sides to the third side.
if you let y = the congruent sides,
C = the constant
x = the non-congruent side,
P = perimeter.
You can set up an equation y = Cx; C will be different in each each example.
so our equation is perimeter (p)
f(x) = 2y + x.
So, for your example, C=5.
2(5x) + x = 11x, your perimeter.
Cleomenius.
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