Wednesday

April 16, 2014

April 16, 2014

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.

**Related Questions**

algebra - how do I do this Solve for x. 3x – 2y = 6 Add 2y to both sides and ...

linear algebra - Use an inverse matrix to solve each system of linear equations...

linear algebra - Use an inverse matrix to solve each system of linear equations...

linear algebra - Use an inverse matrix to solve each system of linear equations...

maths - Use crammers rule to solve the system of linear equations 3x+2y-z = 0 2x...

algebra - needing help with is problem solve for x: 3x-2y=-6 here is my solution...

algebra - A. 3x + y = 8 x-y =6 B. x- 1/2y =2 y=2x-4 C. x + 2y = 9 2y = -x + 13 I...

math-algebra - how do i solve this using the substitution method 3x+2y=7 2x-3y=-...

maths - solve the following simultaneous equation: 5x+2y=29 x-y=-4 2x-y=-1 3x-y=...

Algebra - I need help on this one too, please. Solve for X. 3x-2y=6 I got x=6+2y...