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February 27, 2015

February 27, 2015

Posted by **jenn** on Tuesday, November 17, 2009 at 10:21am.

1. 3x=9

-x+2y=9

3x/3 = 9/3

x = 3

-x(3)+2y = 9

-3+2y = 9

2y = 12

y = 6

is (3,6) correct?

===========

also, can you please tell me how to solve these?

use the linear combinations to solve the linear system:

2.x+y=3

x+2y=6

3. x+y=7

y=-2x+8

thanks

- maths -
**bobpursley**, Tuesday, November 17, 2009 at 11:06amYes, on (3.6)

2)

x+y=3

x+2y=6

subtract the second equation from the first:

x+y=3

-(x+2y=6)

or the result is -y=-3

y=3

then go back and solve for x.

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