Question

A triangle has one side that measures x, another side that measures 2x, and a third side that measures 5 less than x. The perimeter is 31 inches. Which equation would you use to find the value of x? Explain your answer

A. x + 2x + x - 5 = 31

B. x + 2x + x + 5 = 31

C. x + 2x - x - 5 = 31

D. x + 2x - x + 5 = 31

Answer 1

1st side = x
2nd side = 2x

3rd side is x-5
so x +2x + x-5 = 31
answer is A