daysha141
daysha141
17-09-2016
Mathematics
contestada
how to solve for x: 2x+y=3 and x+y=9
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Аноним
Аноним
17-09-2016
The answer for the first one would be: y=3-2x
The answer for the second one would be: y=9-x
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kokodoggie
kokodoggie
17-09-2016
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;
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