#11 Quiz: Direct Variation

A charitable organization brought in $7200 in ticket sales by selling 400 tickets to their annual fundraising banquet. The amount of money raised from ticket sales is directly proportional to the number of tickets sold.
To find the constant of variation, the quantity that goes on top is ​ (a)   and the quantity that goes on bottom is (b)  

• the number of tickets sold
• the amount of money raised

Given that y varies directly with x, use the values specified to write a direct variation equation relating y to x.

y=18, x=6

Mathematical Equivalence

ON

The cost of an antique plate varies directly with its area. If an antique plate with an area of 176 square inches costs $16, what would be the area of an antique plate that costs $11?

• None of these

Graph the direct variation line that passes through the given point..

Tags

CCSS.8.EE.B.5

Select all TRUE statements about direct variation.

• The line passes through the point (0,0)

• The line passes through the origin

• the y-intercept is 0

• If written in y=mx+b form, b = 0

• the x-intercept is 0

What does the equation of a direct variation look like?

If given a (x, y) in a direct variation, you can calculate k, the constant of variation by ___________.

• Dividing "y" by "x"

• Dividing "x" by "y"

• Multiplying "y" by "x"

• Multiplying "x" by "y"

#7 Write the direct variation equation that has the ordered pair (3, -2) as a solution.

Mathematical Equivalence

ON

• No

• Yes, k=2

• Yes, k=-6

• Yes, k=-3

#17 READING: The number of pages [p] a student can read varies directly with the amount of time [t] in minutes spend reading. The student can read 90 pages in 60 minutes. Write an equation that relates [p] and [t]. Predict the number of pages the student can read if 90 minutes is spend reading.