Answer:
x= - 1 ; z = - 9
Step-by-step explanation:
The requester asked for 8 and 11, but I can't see the problem in the picture.
Here are 7 and 10:
#7 5x - 4x + 2 = 1
Combine 5x and -4x to get x
x + 2 = 1
Subtract 2 from both sides
x = -1
#10 -40/2 = z - 11
Simplify -40/2 to get -20
-20 = z - 11
Add 11 to both sides
z = -9
If you want 8 and 11, reupload the problem with a picture that includes them.
