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

Question

Mathematics

Hunter Adams

5 November, 04:28

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

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Answers (2)

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Emelia · Answer 1

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;

Dot · Answer 2

The answer for the first one would be: y=3-2x

The answer for the second one would be: y=9-x