Question

determine if the system has solution,
if yes then find it.
2x+3y+7z=15
3x-4y+2z=1
x+2z=7

Answer 1

:D

Answer 2

from the last equation you get x=7-2z
and then insert it in the second, you get:

3(7-2z)-4y+2z=1
21-6z-4y+2z=1
-4z=1+4y-21
-4z=4y-20|:(-4)
z=y-5

Insert this in the first eq
2(7-2z)+3y+7(y-5)=15
14-4z+3y+7y-35=15
14-4(y-5)+3y+7y-35=15
14-4y+20+10y=50
solve for y;]

Answer 3

kamille it has no solution actualy :D
confusing yes.its supposedto be solved by matrices

Answer 4

oh,sorry!!