SOLUTION: 2x-y -1 7x+6y=-6

Question 1098542: 2x-y -1
7x+6y=-6

Found 2 solutions by josgarithmetic, greenestamps:
Answer by josgarithmetic(39618) (Show Source): You can put this solution on YOUR website!

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Answer by greenestamps(13200) (Show Source): You can put this solution on YOUR website!

While the solution by the other tutor is fine, I don't understand why so many people use substitution to solve pairs of equations that are given in this form, when elimination seems to me so much easier.

multiply the first equation by 6 so that the y term is "-6y"; then when you add the two equations the y is eliminated, giving you a simple equation to solve for x:

[adding the two equations]
So x = 0; now substitute that value in either of the original equations.

and so y = -1.

The solution is (x,y) = (0,-1).
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