1. 4x-5y=0
4x = 5y
x = 5/4y
2. 4x+5y=200
4x = 200 - 5y
x = 50 - 5/4y
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1. 4x-5y=0
4x = 5y
x = 5/4y
2. 4x+5y=200
4x = 200 - 5y
x = 50 - 5/4y