SOLUTION: What are the steps to do X+y=-1 2x+y=3

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Question 922559: What are the steps to do
X+y=-1
2x+y=3
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
We have this system
x%2By=-1
2x%2By=3

Notice how we have the 'y' terms with the same coefficient of 1. We can subtract equation 2 from equation 1 to get:


x%2By=-1
2x%2By=3
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-x%2B0y=-4


Now that we have -x%2B0y=-4. Solve for x


-x%2B0y=-4


-x%2B0=-4


-x=-4


x=4


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Use this value of x to find y.


x%2By=-1


4%2By=-1 Plug in x+=+4


y=-1-4


y=-5


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The solution is x+=+4 and y+=+-5


Together they form the ordered pair (4, -5) which is where the two lines cross.


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Let me know if that helps or not. Thanks.

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