Thursday

July 24, 2014

July 24, 2014

Posted by **Lilly** on Thursday, November 3, 2011 at 12:04am.

2x-3y-2=z

y-x+z=1

-y-2z=7

The answers are: x=-7 y=-5 and z=-1 however I don't know how to go about this.

- Math-System of Equations -
**Reiny**, Thursday, November 3, 2011 at 8:28amFrom the 3rd: y = -2z-7

in the 1st:

2x - 3(-2z-7) - z = 2

2x +6z +21 - z = 2

2x + 5z = -19 (#4)

in the 2nd:

-2z - 7 - x + z = 1

x + z = -8

2x + 2z = -16 (#5)

#4 - #5 :

3z = -3

z = -1

sub into y = -2z-7 ---> 2-7 = -5

sub into 2nd:

-5 - x - 1 = 1

-x = 7

x = -7

so , x = -7, y = -5 and z = -1

**Related Questions**

Math 116 - Consider the following system of equations. y=2x-2 y-2x=9 What can ...

Math 1 - Consider the following system of equations. y = 4x - 4 y - 4x = 3 What...

math - Consider the following system of equations. Y = 3x – 7 Y - 3x = 5 a) The ...

College Algebra - Solve the system of equations. Then classify the system. 7x-7y...

alegebra - solve the system of equations by graphing. then classify the system ...

algebra - solve the system of equations by graphing. Then classify the system as...

Alg 2 - Today we learned how to solve systems of equations with 3 variables, ...

PLEASE CHECK - 1.)Solve for y in the following system of equations. x + 4y = -38...

Discrete Math - I am really stuck on these problems. I've worked a lot of them ...

Algebra - Suppose a linear system of equations has 2012 equations and 2013 ...