Lauren O. answered 02/18/15
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x=lower box
y=upper box
x+y=385
12.5x+10y=4547.5
Solve the first equation for y.
y=-x+385
Substitute this value for y in the second equation and solve for x.
12.5x+10(-x+385)=4547.5
12.5-10x+3850=4547.5
2.5x=697.5
x=279
Substitute this value in the first equation and solve for y.
279+y=385
y=106
ANSWER: x=279; y=106
Check by plugging these values in the original equation.
12.5(279)+10(106)=4547.5