-z-2u+2=4 z=-9-u

To solve the system of equations -z - 2u + 2 = 4 and z = -9 - u, we can substitute the value of z from the second equation into the first equation.

Substitute z = -9 - u into the first equation:

-(-9 - u) - 2u + 2 = 4

9 + u - 2u + 2 = 4

Combine like terms:

u + 11 - 2u = 4

Combine like terms:

-u + 11 = 4

Subtract 11 from both sides:

-u = -7

Divide both sides by -1:

u = 7

Now substitute the value of u back into the second equation to solve for z:

z = -9 - 7

z = -16

So the solution to the system of equations is u = 7 and z = -16.