3x-7y=6 2x+7y=4 Solve by elimination

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asked Oct 18, 2016 32.8k views

5 votes

3x-7y=6
2x+7y=4
Solve by elimination

Mathematics
middle-school

Lnetanel asked

by Lnetanel

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2 Answers

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$3x-7y=6\\ \underline{2x+7y=4}\\ 5x=10\\ x=2\\\\ 3\cdot2-7y=6\\ 6-7y=6\\ -7y=0\\ y=0$

Ton Snoei answered Oct 18, 2016

by Ton Snoei

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$3x-7y=6 \\ \underline{2x+7y=4} \\ 3x+2x=6+4 \\ 5x=10 \ \ \ |/ 5 \\ x=2 \\ \\ 3x-7y=6 \\ 3 * 2-7y=6 \\ 6-7y=6 \ \ \ |-6 \\ -7y=0 \ \ \ |/ (-7) \\ y=0 \\ \\ (x,y)=(2,0)$

Tianyu answered Oct 23, 2016

by Tianyu

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