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

Question

Magdalena Kent

Mathematics

26 October, 15:14

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

+1

Answers (2)

Know the Answer?

Brendan Kemp · Answer 1

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

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

Kassidy Daniels · Answer 2

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;