1. + Day 17: Direct Variation

2. + 1. What is a constant of variation?

3. + 2.

4. + 3. What is the parent function of the graph? A y = x B y = x 2 C y = 6x 2 + 12 D y = 10x - 4

5. + 4.

6. + 5.

7. + 6. What is the x intercept of y= 6x - 18 A 6 B -18 C 3 D -3

8. + 7. On a certain day the exchange rate of Mexican pesos for U.S. dollars was approximately 10 pesos for 1 dollar. If an exchange of 4,000 pesos was made that day, what was the approximate value of the exchange in dollars? F $40 G$400 H $4,000 J $40,000

9. + 8. Direct Variation means: a. The y intercept is always zero b. The x intercept is always zero c. That the line is quadratic d. That the slope is zero

10. + 9. What are two different meanings of the word ‘solution’? (Hint: Look at Day 16 Notes)

11. + 10. For what value of x is (x, − 3) a solution for 4x − 3y = 21? A 11 B − 3 C − 11 D 3

12. + 11. If y varies directly with x, if x is 12 and y is 3, what is the equation? A y =.25x B y = 4x C y = 1/2x D y = 12x

13. + 12. What is the slope of 6y = 12x + 24? A 6 B 12 C 2 D 4

14. + 13. At Vicky’s Grocery Store the cost of a bag of ice varies directly with the weight of the ice. If a 7-pound bag of ice costs $0.86, which of the following best represents the cost of a 20-pound bag of ice? F $1.63 G $2.86 H $3.01 J $2.46