Direct Indirect Variations

Which of the following represents direct variation?

• y = kx

• y = k/x

• y = x/k

• y = mx + b

y varies directly with x, and y is 84 when x is 16. What is the constant of proportionality?

• y = (21/4)x

• k= 21

• k= 5.25

• k= 4/21

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

• $2

• $308

• $1.57

• $265

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

• Yes; 1/4

• Yes; 4

• Yes; 1/2

• No

Which of the following represents indirect variation?

• y = kx

• y = k/x

• y = x/k

• y = mx + b

Y varies inversely with x, and y is 0.5 when x is 4. Which equation represents this situation?

• y=2x

• y=2/x

• y=4x

• y=x/2

The image is an example of the graph of a(n)

• direct variation

• inverse variation

• neither

• both

If x and y are in an inverse variation then which of the following is correct?

• x - y = constant

• x + y = constant

• xy = constant 

• x⁄y is constant 

Is this a direct variation?
y=2x

• yes

• no

Does the relationship represent direct variation?

• Yes

• No