SOLUTION: Hi Pl Can you show me how to solve this problem. I am not sure if the category is correct.. I just chose one. 5x−4y+3z=15 6x+2y+9z=13 7x+6y−6z=6 My email add:

Algebra ->  Matrices-and-determiminant -> SOLUTION: Hi Pl Can you show me how to solve this problem. I am not sure if the category is correct.. I just chose one. 5x−4y+3z=15 6x+2y+9z=13 7x+6y−6z=6 My email add:      Log On


   

Question 908961: Hi
Pl Can you show me how to solve this problem. I am not sure if the category is correct.. I just chose one.
5x−4y+3z=15
6x+2y+9z=13
7x+6y−6z=6
My email add: playatthepark@gmail.com
I am a mom.
Found 2 solutions by josgarithmetic, lwsshak3:
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!


(1/6)R2,(1/7)R3,(1/5)R1


R2-R1; R3-R1




That is only a start. Not yet finished.
(The last two are not rendering and I do not know why).

Answer by lwsshak3(11628) About Me  (Show Source):
You can put this solution on YOUR website!
5x−4y+3z=15
6x+2y+9z=13
7x+6y−6z=6
***
15x−12y+9z=45(mult. 1st eq. by 3)
6x+2y+9z=13(2nd eq.)
subtract:(eliminating z)
9x-14y=32(4th eq.)
..
10x−8y+6z=30(mult. 1st eq by 2)
7x+6y−6z=6(3rd eq)
add:(eliminating z)
17x-2y=36(5th eq.)
..
9x-14y=32(4th eq.)
119x-14y=252(mult. 5th eq. by 7)
subtract:(eliminating y)
-110x=-220
x=2
14y=9x-32=-14(4th eq.)
y=-1
3z=15-5x+4y=15-10-4=1(1st eq.)
3z=1
z=1/3
Check:x=2, y=-1, z=1/3
5x−4y+3z=10+4+1=15
6x+2y+9z=12-2+3=13
7x+6y−6z=14-6-2=6
check ok