Scatterplot and direct variation

Which graph shows an example of direct variation?

In a direct variation, y = 39 when x = 3. Find the value of y when x = 2.

Is the given table a direct variation? Is so, what is the constant?

Select 2 answers

On a scale of one to 100, your teacher crankiness is directly proportional to the students talking while she is talking. If two students are talking, the teachers' crankiness index is a 5. What is her crankiness index when 6 students are talking? Type the number below

(a)  

Write the equation for the table given. Remember the format for direct variation

(a)  

The amount of money earned on a job varies directly to the number of hours worked. If $70.00 is earned in 5 hours, how much money is earned in 22 hours of work?

(a)  

The number of cakes sold varies directly with the number of people who attend a fair each day. If 200 cakes are sold when 3000 people attend the fair, which two statements are true? Select two answers

Y varies directly with x, and y is 84 when x is 16. Which equation represents this situation?