1.What is direct variation? 2. What is the constant ratio called?

3. If the height of the water in a pool is 2 inches after 5 minutes, what is the constant of proportionality?

4. If pizzas cost $8 each plus a $3 delivery charge, is there direct variation between the cost of the pizzas and the number of pizzas bought?

5.What is the unit cost in problem # 4?

1. describes a simple relationship between two variables.

2.two variables that are directly proportional to one another will have a constant ratio

3.the constant proportionality is the ratio between the two

4.yes

5. 24

Step-by-step explanation:

3.

y=k/x

2=k/5 divide 5 both side

k=10

5.

y=k/x

8=k/3 divide 3 both side

k=24

really really sorry if i'm

-12 -5(x + 4) = 3x

-12 - 5x - 20 = 3x

-12 - 20 - 5x = 3x

-32 - 5x = 3x

    + 5x   + 5x

-32 = 8x

8         8

- 4= x

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