Question: solve by substitution 4x-3y=10 2x+3y=4? 

Answer: 4x-3y = 10...1\n4x=10+3y\nx=(10+3y)/4...2\n\n2x+3y=4\n2((10+3y)/4)+3y=4\ny=-2/9\n\nx=(10+3y)/4= -8/3
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