Work Shown:
y = expression for the missing side
perimeter = 9x - 1
side1+side2+side3 = perimeter
(2x+4) + (x-2) + (y) = 9x - 1
3x+2 +y = 9x-1
y = 9x-1-3x-2
y = 6x - 3
8.4m questions
11.1m answers