Question

solve by elimination
x-y+z=-1
x+y+3z=-3
2x-y+2z=0

Answer 1

are you sdoing matrices?

Answer 2

no its umm systems

Answer 3

alright so with systems you know the 3 rules you can do right?

Answer 4

elimination
subsitution

Answer 5

what you want to do in this case is take equation 1 and 3 and try to eliminate a variable by adding them together

Answer 6

ok

Answer 7

and then take 1 and 2 and try to get them to cancel the same variable

Answer 8

ok

Answer 9

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

Answer 10

not quite,alright so you have equation 1 and 2

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

when dealing with systems you can add two equations and replace it with the row equation you are adding them with so if you were to add equation one with 2

you'd get
x-y+z=-1
2x+4z=-4
2x-y+2z=0

Answer 11

see how it cancels a variable y out?

Answer 12

oh yea ok

Answer 13

so what would why equal though?

Answer 14

once you cancel the y variable in another equation you'll be able to get one variable and then find the others by using the equations you started with

Answer 15

ok

Answer 16

your answers should be (x,y,z)=(4,2,-3)

Answer 17

do you understand... i might be able to post a screen shot of my work if you want?