Explanation:
Well if the trianagles are equal then
3x-y = x+2y and
5x+3y = 8x-7 Now, do you know how to solve systems (2) of equations?
Re arrange the first equation
2x - 3y = 0 the second equation is
-3x + 3 y = - 7 add the two equations to get
-x = -7 then x = 7 ( and y = 4 2/3)
Now hypotenuse = 8x - 7 = 8 (7 ) - 7 = 49 units