Question 907405
x+y=3,
6*x+3*y=15
x=3-y
6*(3-y)+3*y=15
18-6y+3*y=15
-3*y=-3
y=1
x=3-y
x=2 lbs at $6 and  y=1 lb at $3
check
2+1=3
6*x+3*y=15
6*2+3*1=15
12+3=15
15=15
ok