Thursday

September 18, 2014

September 18, 2014

Posted by **mike** on Friday, December 18, 2009 at 7:17pm.

x+y+z=7,x-y+2z=7,2x+y+3z=15

The final answer came out to be

x=4

z=2

y=1

- Algebra Question -
**Reiny**, Friday, December 18, 2009 at 11:36pmThis problem just "begs" to be done by elimination, look at the y values

add #1 and #2 2x + 3z = 14 #4

add #2 and #3 3x + 5z = 22 #5

triple #4 -- 6x + 9z = 42

double #5 -- 6x + 10z = 44

subtract #5 - #4

z = 2

sub into #4 -- 2x+6 = 14 , x = 4

back into #1

4 + y + 2 = 7

y = 1

**Answer this Question**

**Related Questions**

Substitution Method-Plz help - Use the Substitution method to solve the system ...

algebra - Here is my question. How do you solve th substitution method in this ...

Algebra - The problem is 9x+4y=-12 x=26-5y Solve by substitution method

Grade 11th Maths - (Second Time posting this problem)This problem is related to ...

Algebra - |2 0 4| |3 1 5| |-1 1 -2| I needed the inverse of the matrix above and...

Algebra - Use substitution method to solve the linear system. Can someone please...

Algebra 1 HELP PLZ!!! - Use the Substitution method to solve the system of ...

Algebra - I am confused on how solve this substitution problem 4y+3=3y+x 2x+4y=...

substitution method - Solve by substitution method please help me solve this. I ...

Honors Algebra II - I've been stuck on a problem with my homework for a couple ...