posted by Nita .
The perimeter of an equilateral triangle is 7 inches more than the perimeter of a square,and the side of the triangle is 5 inches longer than the side of square.Find the side of the triangle.
Let triangle side length be T and square side length be S.
3T = 4S + 7
T = S + 5
4T = 4S + 20
Subtract the first equation from the last to get T