# Algebra

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What is the value of x in the solution of this system?
-3x-y+2z = 7
2y+z= -5
3x+6y= -21

4
2
1
3

• Algebra -

thx :)

• Algebra -

5y + 2z = -14
from the 2nd: z = -2y-5
plug into 5y + 2z = -14
5y + 2(-2y-5) = -14
y = -4

into the 3rd:
3x -24 = -21
3x =3
x = 1

btw: z = 3

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