Question

The equilateral triangle and the rectangle have the same perimeter.

triangle: 2.5x + 10. rectangle: x +12 + 8x

what is the value of x?
what is the perimeter of the rectangle?

Answer 1

Answer: x = - 4/13

Explanation:

2.5x+10=x+12+8x

10-12 = x+8x-2.5x

-2 = 6.5x

x = -4/13