2 step word problems. 2. Joe and 3 of his friends went to Pizza Haven. They bought a pizza and he ordered a drink that cost $3. If Joe paid $9, how much did the pizza cost?

$6

Step-by-step explanation: I'm assuming that Joe bought the pizza and drink with his own money since it doesn't say that they divided the price. Since his drink was $3, that means that the pizza must have been $6.

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