Question

Solve by the Substitution Method:

-x+2y+3z=1
z=-2
2x+y+3z=15

Answer 1

Help?:>

Answer 2

-x+2y-6=1 ..............> 1
therefore: -x+2y=7 ....so.... x=2y-7

2x+y-6=15................>2
therefore:2x+y=21
therefore bu Sub. in 2
2(2y-7)+y=21 .......so...... 5y-7=21
therefore: 5y=35 y=7
therefore: x=7

Answer 3

Thank you so much. (:

Answer 4

wlcm :)