The difference of the length between the 2 buildings D=L1-L2 D=95-55 D=40 feet we use Pythagoras formula D^2+X^2=Z^2 X=distance between buildings Z=length of the zip line Z=50 feet
5 x + 3 y = 41 / * 3 3 x + 2 y = 26 / * ( - 5 ) ----------------------------- 15 x + 9 y = 123 + - 15 x - 10 y = - 130 --------------------------- - y = - 7 / * ( - 1 ) y = 7 Answer: Each program costs D ) $7