Question 1146186
.9x+1.2y=60
x+y=60
.9x+1.2y=x+y
.1x=.2y
x=2y
2y+y=60
3y=60
y=20 at $.90
x=40 at $1.20 
check
.9*40+1.2*20=60
36+24=60
60=60
ok