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How to solve for x: 2x+y=3 and x+y=9
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5 votes
How to solve for x: 2x+y=3 and x+y=9

User Holocronweaver
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2 Answers

7 votes
X+Y=9; X=9-Y; 2X+Y=3; substitute above equation for X; 2(9-Y)+Y=3; 18-2Y+Y=3; 18-Y=3; 18=3+Y; 15=Y; X+Y=9; X+15=9; X= -6; 2X+Y=3; 2(-6)+15=3; -12 + 15 = 3; 3 = 3;
User Lars De Bruijn
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8.2k points
4 votes
The answer for the first one would be: y=3-2x
The answer for the second one would be: y=9-x
User Matt Frear
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7.1k points
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