Solve the system by substitution. ( explain how you did it ill give brainliest)

-x-y-z=-8
-4x+4y+5z=7
2x+2z=4

  (x, y, z) = (3, 6, -1

Step-by-step explanation:

You can make a simple expression to substitute for x using the last equation.

  2x = 4 -2z

  x = 2 - z . . . . . . divide by 2

Now, substitute that into the first equation:

  -(2 -z) -y -z = -8 . . . .substitute for x

  -2 +z -y -z = -8 . . . . eliminate parentheses

 -2 -y = -8 . . . . . . . . . simplify

  6 = y . . . . . . . . . . . . add 8+y

We can substitute for both x and y in the second equation:

  -4(2 -z) +4(6) +5z = 7

  -8 +4z +24 +5z = 7 . . . . . eliminate parentheses

  9z = -9 . . . . . . . . . . . . . . .simplify, subtract 16

  z = -1 . . . . . . . . . . . . . . . . . divide by 9

And from our expression for x, we get ...

  x = 2 - z = 2 -(-1) . . . . . substitute for z

  x = 3

The solution is (x, y, z) = (3, 6, -1).

a line is an defined derm because it

a)contains an infinite number of points b) can be used to create other geometric shapes c)describes something that does not have width or depth d) is a term that does not have a formal definition. a line is an undefined term because it: contains an infinite number of points.

4444444444444 i think