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Cohen
Mathematics
30 April, 19:28
Substitute y=-x+6 x-2y=-6
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Perla Green
30 April, 19:48
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x-4x+12=6
-3x+12=6
-3x+12-12=6-12
-3x=-6
-3x/-3=-6/-3
x=2
Plug (2) in for x in L2 and solve for y:
y=2 (2) - 6
y=4-6
y=-2
The solution (x, y) = (2,-2)
Check in both equations by substituting (x, y) = (2,-2) and see if it equals out:
L1) (2) - 2 (-2) = 6
2+4=6
6=6 L1 checks out.
L2) (-2) = 2 (2) - 6
-2=4-6
-2=-2 L2 checks out also, so we can say with confidence that the solution is right.
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