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how to do system linear quations

Mathematics
Tutor: None Selected Time limit: 0 Hours

2x + y = 4

x - 3y = 9

i really dont know how to do it. and i need to figure out how to 

Feb 18th, 2015

2x+y =4

2x-6y =18

7y = -14

y =-14/7 = -2

2x-2 =4

2x =4+2 =6

x =6/2 =3

x=3, y= -2

Feb 18th, 2015

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Feb 18th, 2015
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