Question

SOLVE FOR Z:
x=2.5y
x+y+z=66
x-2y-2z=-12

A. z = -102
b. z = 16
c. z = 10
d. z = -74
e. none of these.

i'm getting C? z = 10

Answer 1

substitution. (look at your first equation)

Answer 2

i did solve by substitution, and got 10 for z.

Answer 3

so basically substitute your value for y into the second equation

Answer 4

then solve the two left over

Answer 5

how do you solve for y?

Answer 6

i got 40 for x 16 for y and 10 for z

Answer 7

is that correct?

Answer 8

yep good job

Answer 9

thank you for helping me :)