Solve 3q - 5 = 13 for q.

q =

solve -12 = z ÷ 3 for z.

z =

answer:

3q - 5 = 13

3q = 13 + 5

3q = 18

q = 18 / 3

q = 6

-12 = z ÷ 3

-12 × 3 = z

-36 = z

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional

-2/