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Day 17: Direct Variation
+1.
What is a constant of variation?
+2.
+3.
What is the parent function of the graph?
A y = x
B y = x2
C y = 6x2+ 12
D y = 10x - 4
+4.
+5.
+6.
What is the x intercept of y= 6x - 18
A 6
B -18
C 3
D -3
+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
+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
+9.
What are two different meanings of the word ‘solution’? (Hint: Look at Day 16 Notes)
+10.
For what value of x is (x, −3) a solution for 4x − 3y = 21?
A 11
B −3
C −11
D 3
+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
+12.
What is the slope of 6y = 12x + 24?
A 6
B 12
C 2
D 4
+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
