Question

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Answer 1

use substitution.

rewrite the 2nd equation with z as the subject and then substitute that into the 1st and 3rd equations.

you will then have 2 equations with 2 unknowns, which can ba solved by elimination

Answer 2

z= -5-4x? so (x)-(y)+3(-5-4x)= -11 ?

Answer 3

yep.... simplify that by distributing and collecting like terms

Answer 4

then its the same substitution into the last equation

Answer 5

11x-y=4?

Answer 6

so x+3y+(-5-4x)= -17?

Answer 7

simplify that equation and you get

-3x + 3y = -12

so now you have 2 equations in 2 unknowns

-11x - y = 4 equation (4)
-3x +3y = -12 equation (5)

multiply the 1st equation by 3 and then add to the 2nd equation to eliminate y

-33x - 3y = 12
- 3x +3y = -12
---------------
-36x = 0

so x = 0

substitute into equation 4 to find y

and subsitute into

4x + z = -5

Answer 8

when you get the values for x, y and z, check by substituting into the 1st equation...