Question

WILL FAN AND MEDAL
Solve the system by substitution:
2x-y+z=-4, z=5, -2x+3y-z=-10

a) (-8,7,5)
b) (-8,-7,5)
c) (8,-7,5)
d) (-8,-7,-5)

Answer 1

Is the prpbelem giving you the answer for Z right off the bat?

Answer 2

*problem

Answer 3

why is this still open? do you need more help?

Answer 4

Its a system with three variables

Answer 5

i mean obviously z is going to be 5 because its in all the answers

Answer 6

given the value of z when you substitute it is really 2 variable simultaneous
use 2 equations then a different 2 note z = 5 is given
you only have x and y
with one equation write in the form x( or y) = whatever number 1
with the second equation in the form the same chosen varianble = whatever number 2
variable = variable so let whatever1 = whatever2 and solve

Answer 7

im still confused..