Question

My answer is B


If you were to use the substitution method to solve the following system, choose the new system of equations that would result if x was isolated in the second equation.
3x - 5y + z = 12
x + 6y - z = -4
2x - 5y - 2z = -8 (4 points)
Answer

A. ) 4x + y = 8
-17y = 0

B.) 2x - 11y = 16
4x + 7y = -16

C.) -23y + 4z = 24
-17y = 0

D.) 13y - 2z = 24
7y - 4z = 0

Answer 1

So we want to isolate x in the second equation, which is
x + 6y - z = -4

subtract 6y from both sides, add z to both sides to get:

x = -4 - 6x + z

Now substitute that into the first and third equation in place of x

Answer 2

The answer I got was C...

Answer 3

oops, that should be x = -4 - 6y + z

Answer 4

is C the wrong answer?

Answer 5

C looks correct :)

Answer 6

thank you:))