Wednesday

April 1, 2015

April 1, 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.

**Answer this Question**

**Related Questions**

algebra - Requesting help. (I must reckon, that X is a variable, and y is y-...

Algebra - Use the substitution method to solve the linear system. 1/8p+3/4q=7 3/...

algebra - Use the substitution method to solve the linear system. Thanks! s= t+4...

Algebra - -3x + 2y = 8 x + 4y = -4 use substitution method to solve the linear ...

algebra - how do you use the substitution method to solve the linear system? -2x...

math - Use a substitution method to solve the linear system 2a=8 a+b=2

alg 1 - use the method of substitution to solve the system of linear equation 2x...

algebra - use method of substitution to solve the system of linear equation 3x+...

Math 2 questions - Use the substitution method to solve each linear system: -x+...

TO ANY MATH HELPERS - Pleeeese help! Use the substitution method to solve each ...