Question

Solve the system by substitution. (Problem and answer choices are in comments)

Answer 1

since in the second eq it is given z=5

Answer 2

so 4 option is not possible

Answer 3

not put the value of z in firsth eq u will get
2x-y=-9

Answer 4

from here u can get the value of y
2x+9
put it in the 3rd eq..

Answer 5

-2x+3(2x+9)-5=-10
solve for x

Answer 6

x=-8?

Answer 7

b option is correct..

Answer 8

haha yay i overpower u:)