Thursday

December 18, 2014

December 18, 2014

Posted by **Terri** on Tuesday, February 24, 2009 at 8:52pm.

2x-y+z=3

x+3y-2x=11

3x-2y+4z=1

- algebra -
**Reiny**, Tuesday, February 24, 2009 at 9:51pmdouble the first equation, then add that to the second to get

5x+y = 17

double the second, then add that to the third to get

5x + 4y = 23

now subtract those last two equations to get

3y = 6

y = 2

put that into 5x + y = 17 for

5x = 15

x = 3

now in the first

6 - 2 + z = 3

z = -1

I assumed your second equation had -2z at the end. typo ??

- algebra -
**Terri**, Tuesday, February 24, 2009 at 10:22pmThanks, yes, typo

I just finished solving it a long way, I solved the first two, then the second two,,etc etc. Your way seems much easier, I did get the same answers, yeah!!!! But, will your way always work?

**Answer this Question**

**Related Questions**

Algebra, help needed - I need help I don't know how to solve this system Solve ...

Algebra - I need help I don't know how to solve this system Solve the following ...

algebra 2 - Nonlinear systems Solve the system by elimination. y=x^2+2 -4x-y=10 ...

algebra 2 - Nonlinear homework... Solve the system by elimination. 1)y=x^2+2 -4x...

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

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

algebra - i need help with these problems (either a solution or how to plug them...

math - Please explain in detail how to solve each question: At a certain high ...

Algebra - Use Cramer's rule to solve the following system of equations. If D=0, ...

Algebra 2 - Solve each system 3x+2y= -2 9x- y= -6 I know how to solve for x but ...