Wednesday

December 17, 2014

December 17, 2014

Posted by **Diane** on Sunday, July 5, 2009 at 11:18pm.

3x + 6Y - 9z = 3

5x - 7y + 10z = -4

11x +4y - 6z = 2

- college algebra -
**bobpursley**, Sunday, July 5, 2009 at 11:32pmtake the first equation, and the third equation.

mulitiply the first by 2, adn the third by 3.

6x+12y-18z=6

33x+12y-18z=6

that implies that x is zero.

then the first and second

6y-9z=3

-7y+10z=-4

multply the first by 10, the second by 9

60y-90z=30

-63y+90z=-36

add,

-3y=6 or y=-2

solve for z in any equation, check your answers.

- college algebra -
**Reiny**, Sunday, July 5, 2009 at 11:38pmSince you don't specify which method, let's use good ol' elimination.

#1x2 ---> 6x+12y-18z=6

#3x3 ---> 33x+12y-18z=6

subtract, by luck both z and y disappear

x = 0

#2x3 ---> 15x-21y+30z=-12

#3x5 ---> 55x+20y-30z=10

add

70x-y=-2 but x=0, so

y = 2

sub back into #3 to get z = 1

x=0

y=2

z=1

- college algebra -
**Anonymous**, Thursday, July 9, 2009 at 8:18pm2x^3(2x^2+4x+3)

**Answer this Question**

**Related Questions**

Algebra, check. - 10z-4=10z-2 So I subtract 4 from the 2 right? and 10 from the ...

college algebra - Solve the inequality algebraically 11x-3¡Ý-4x^2

COLLEGE ALGEBRA ..HELP! - Solve by completing the square 12x^2+11x=5

COLLEGE ALGEBRA - Solve by completing the square 12x^2+11x=5

college algebra - solve the inequality algebraically 11x-3 is greater than or ...

algebra - college - Solve using the elimination method. Show your work. If the ...

College Algebra - Solve using the elimination method. Show your work. If the ...

math - I solved this problem 12x-6=11x -6+6=0 11x+6 12x=11x+6 12x-11x=x 11x-11x=...

algebra PLZ HELP!!! - y= 9/11x-17 9x-10y=179 You need to use parentheses to tell...

Intermediate Algebra - Combine like terms: -3x^2+2x-4x^2-9+6x-2x^2+8 Solve for x...