12=3x-6 a.18 b.6 c.3 d.-6

16=4x+8
a.1/2 b.4 c.2 d.6

4z+8=40
a.10 b.4 c.8 d.28

5x-7=38
a.5 b.6 c.14 d.9

-3x-9=24
a.11 b.-11 c.5 d.-5

12=3x-6 is 6

16=4x+8 is 2

4z+8=40 is 8

5x-7=38 is 9

-3x-9=24 is -11

Step-by-step explanation:

for 12=3x-6 you would get x by itself so first you add the 6 to the 12

you get 18 then you try to get the x by itself so you divide 3x by 3 and divide 18 by 3 as well. So you end up with 6=x. Repeat with every problem

3x + 4y -25 =0 represents the amount of change sianna should recieve