Question

What is the solution of the system below?
x = -3y - 4
-3y = 2x - 7
z = -6x +y
The possible Answers are:
x=-5,y=11,z=-71
x=11,y=-71,z=-5
x=-71,y=-5,z=11
x=11,y=-5,z=-71 12 years ago

Answer 1

Have you made an attempt?

Answer 2

Yes. I came up with the last one

Answer 3

Yup, you're right.

Answer 4

Thanks, I needed the reassurance :)

Answer 5

You're welocme!

Answer 6

*welcome

Answer 7

x = -3y - 4
-3y = 2x - 7
-3y = 2(-3y - 4) - 7
-3y = -6y - 8 - 7
-3y = -6y - 15
-3y + 6y = -6y + 6y - 15
3y = -15
y = -5
_____
-3y = 2x - 7
-3(-5) = 2x - 7
15 = 2x - 7
15 + 7 = 2x
2x = 22
x = 11
_____
z = -6x +y
z = -6(11) + (-5)
z = -66 - 5
z = -71