x - $100
y - $50
100x+50y=8400
x+y=120
x=120-y
100(120-y)+50y=8400
12000-100y+50y=8400
-50y=-3600
y=72
x=120-72
x=48
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x - $100
y - $50
100x+50y=8400
x+y=120
100x+50y=8400
x=120-y
100(120-y)+50y=8400
12000-100y+50y=8400
-50y=-3600
y=72
x=120-72
x=48