0. 50 x + 0.20 y = 3.60 Multiply both sides by 2
x + 0.4 y = 7.2
x + 0.4 y = 7.2
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x + y = 9
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0 - 0.6 y = - 1.8
- 0.6 y = - 1.8 Divide both sides by - 0.6
y = - 1.8 / - 0.6 = 3
y = 3
x + y = 9
x = 9 - y = 9 - 3 = 6
x = 6 , y = 3
.50x+.20y=3.60
x+y=9
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