Saturday

January 31, 2015

January 31, 2015

Posted by **david** on Monday, July 8, 2013 at 6:07am.

- (pls help) algebra -
**Steve**, Monday, July 8, 2013 at 9:04amhere are several ways to do this (as I'm sure your textbook will show - read it, and do web searches for alternate presentations).

Substitution:

(1) 4x+y-3z = 1

(2) 6x-y-4z = 7

(3) 10x+2y-6z = 5

From (1) we see that y = -4x+3z+1, so plug that into (2) and (3):

6x - (-4x+3z+1) - 3z = 7

10x + 2(-4x+3z+1) - 6z = 5

or

(4) 10x -6z = 8

(5) 2x = 3

From (5) we see x = 3/2

Plug that into (4) and z = 1

Plug x and z into any of the original equations and y = -2

Besides substitution, there's elimination, determinants, matrices, and other methods.

- (pls help) algebra -
**Steve**, Monday, July 8, 2013 at 9:11amExtra credit: find and fix my typo.

**Answer this Question**

**Related Questions**

Math - Can u pls pls pls solve this algebraic expression?? I cant solve it ...

math pls help!!!!! - these are the few i dont know/im not sure. pls help! The ...

algebra - (3x squared-10x)divided by(x-6)=3x+8+48/x-6. but i have no idea how ...

science - pls. pls. pls. somebody help me...you see im on a science class and i ...

Chemistry :'( - (d) Which of the following sets of quantum numbers is not ...

geography - hi,i have make a project on hurricane Katrina on disaster management...

Help pls. - Compute the acceleration of the block sliding down a 30 deg ...

CHEMISTRY> HELP QUICK! pls - I GOT THIS WRONG IN AN ASSIGNMENT. I HAVE AN ...

Finance - Omega Instruments has budgeted $300,000 per year to pay for certain ce...

Math - Pls help .[1] Solve the eguation 4*=28. [2] change 1/20 to decimal [3] ...