Question

What is the value of x?

see attachment below

Answer 1

x = 31

Explanation:

The perimeter is the sum of the equal-length sides:

63 = (x -10) +(x -10) +(x -10)

63 = 3x -30 . . . . . . . . collect terms

21 = x -10 . . . . . . . . . . divide by 3

31 = x . . . . . . . . . . . . . add 10