Answers

2014-03-14T20:14:08+08:00
What is to be found? What's the value of y? Vice versa if you're looking for y.

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2014-03-15T22:12:04+08:00
2x+y=-1
x=2y-13

we have the value of x now lets substitute
2x+y=-1
2(2y-13)+y=-1
4y-26+y=-1
5y=25
y=5

lets substitute y in the value of x
x=2y-13
x=2(5)-13
x=-3
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