Friday

April 18, 2014

April 18, 2014

Posted by **MaKenzie Smith** on Saturday, November 13, 2010 at 7:16pm.

Ok so i dont really totally get these problems. Can you help me solve this one? and explain everything please?

2x+3y=6+z

x-2y=-1-z

3x+y=-1+3z

- Algebra 2 -
**bobpursley**, Saturday, November 13, 2010 at 7:28pmput them in standard form (x,y,z)

2x+3y-z=6

x-2y+z=-1

3x+y-3z=-1

You can solve these a number of ways, I will show you one.

add 1st and second equations

3x+y=5

now multiply equation 2 by three, then add equations 2 and 3.

6x-5y=-4 check that.

now on these two remaining equations, multiply the first by 2, then subtract.

7y=14

y=2 work back up to find x, then z.

- Algebra 2 -
**MaKenzie Smith**, Saturday, November 13, 2010 at 7:39pmOk, this helps a lot, but hold on, i dont get how you got 7y=14? because when i multiply 3x+y=5 by (-2) i get -6x-2y=8. And then when combining that with 6x-5y=-4 i get -7y=4? how did you get 7y=14???

- Algebra 2 -
**bobpursley**, Saturday, November 13, 2010 at 7:43pm3x+y=5 multiply -2, your way

6x-5y=-4 to get

-6x-2y=-10

6x-5y=-4 add to get

-7y=-14

y=2

- Algebra 2 -
**MaKenzie Smith**, Saturday, November 13, 2010 at 7:46pmOh wait, i forgot to multiply the 5 by -2! (idk how i got 8, but watever its not that important) so right you would get y=2.

ok i think i get it now! THANKS!

**Related Questions**

Algebra - Solving Linear Equations - Elimination Write whether each of these ...

to annonymus can you help me with math - How do i solve inequalitites with three...

Algebra II - Right now we're doing systems of Linear Equations in Three ...

Algebra - solving linear equations with 3 variables 1) x+y=1300 2) x+2z=1400 3) ...

Algebra - Solving systems of linear equations in 3 variables... 1) 3x-2y+2z=1 2...

math - List advantages and disadvantages comparing and contrasting solving ...

Algebra - Can you please give an example step by step of how to solve a system ...

algebra 1 help - I am having a hard time understanding these problems would some...

algebra - I'm working on solving linear systems by substitution, here are the ...

algebra - I do not know how to solve the following systems of linear equations ...