Question 655125
X*Y=100
X=7Y-3
(7Y-3)Y=100
7Y^2-3Y-100=0
(7Y+25)(Y-4)=0
7Y+25-0
7Y=25/7 ANS.
Y-4=0
Y=4 ANS.
X*4=100
X=100/4
X=25 ANS.
PROOF:
25=7*4-3
25=28-3
25=25