Friday

December 19, 2014

December 19, 2014

Posted by **Eli** on Saturday, December 11, 2010 at 2:28am.

x + y + z = -1

2x + 2y + 5z = 1

5x + 2y + 3z = 8

what is the value of x in the solution?

- College Algebra -
**bobpursley**, Saturday, December 11, 2010 at 11:06amBy what method are you using. If not your calculator on matricies, then Irecommend the method of determinants.

- College Algebra -
**Prakash**, Saturday, December 11, 2010 at 4:24pmUse simultaneous equation method:

x=-y-z-1...(1)

Now, the equation 2 become:

2(-y-z-1)+2y+5z=1

-2y-2z-2+2y+5z=1

3z=1+2; z=3

Now equation 1 becomes

x=-y-3-1=-y-4; i.e, x=-y-4....(a)

equation 3 becomes:

5(-y-4)+2y+3(3)=8

-5y-20+2y+9=8

-3y=19; y=-19/3

Now the very first equation becomes

x+2(-19/3)+3=1

x=1-3+38/3=38/3-2=12.7-2=10.7

hence x=10.2

**Answer this Question**

**Related Questions**

College Algebra - Solve the system: 4x-3y=-3 y=6x-13 What is the value of y in ...

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

College Algebra - Solve the following equation in the complex number system x^4+...

College Algebra - Solve the system of equations using matrices. If system has no...

algebra - use substitution to solve the linear system 3x+2y=-5 4x-3y=16 help plz...

algebra - use substitution to solve the linear system 3x-y=15 x+2y=-2 Solve for ...

College Algebra - How to solve this system? x + [(3x-y)/(x^2+y^2)] = 3 y - [(x+...

college algebra - solve the system 2x+y=-4 -x+y= 2

College algebra - Solve the system Y=3x-2 6x-2y=30

College algebra - Solve the system X=2y+3 3x+4y=59