Question

A triangle has one side that is 5 inches long and the other two sides are both of length x. Write an expression for the perimeter of the triangle in terms of x and then use the expression to find the perimeter when x=10.

Answer 1

Let P = perimeter

P = 3x + 5

Let x = 10

P = 3(10) + 5

P = 30 + 5

P = 35