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2x +y =4 and 5x + 4y = 7
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2x +y =4 and 5x + 4y = 7

User Rageesh Geetha Raman
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x=2-y/2 for the first problem
y=4-2x for the first problem

x=7/5-4y/5 for the second problem
y=7/4-5x/4 for the second problem
User SergioR
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