Question 130592
X+Y=12 OR X=12-Y
3XY=105
3(12-Y)Y=105
36Y-3Y^2=105
-3Y^2+36Y-105=0
-3(Y^2-12Y+35)=0
(X-5)(X-7)=0
Y-5=0
Y=5 ANSWER.
Y-7=0
Y=7 ANSWER.