Quiz Direct and inverse variation

Which equations/formulas represent direct variation and inverse variation?

Select the correct answers.

• Direct Variation Equation: y= kx

• Direct Variation Equation: $y=\frac{k}{x}$

• Inverse Variation Equation: y= kx

• Inverse Variation Equation: $y=\frac{k}{x}$

Tell whether x and y show direct variation, inverse variation, or neither.

• direct variation

• inverse variation

• neither

Tell whether x and y show direct variation, inverse variation, or neither.

(Required: Show your work by hand- solve for y)

• direct variation

• inverse variation

• neither

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

(Required: Show your work by hand to prove or disprove your answer!)

• Yes; 1/4

• Yes; 4

• Yes; 2

• No

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?

(Required: Show your work by hand)

• $2

• $308

• $1.57

• $265

Which of the given graphs is a direct variation?

• A
• B
• C
• D

y varies directly with x, if y=39 when x=3. Find the value of y when x=2.

(Required: Show your work by hand)

• 26

• 3

• 58.5

• 2

Does the table show an inverse variation?

• Yes
• No

Given that y varies inversely with x, if x =7 and y = 4, what is y when x = 2?

(Required: Show your work by hand)

• 14

• 10

• 2

• -14

The current in a simple electrical circuit varies inversely with the resistance. If the current is 80 amps when the resistance is 50 ohms, find the current when the resistance is 40 ohms.

(Required: Show your work by hand)

• 90 amps

• 100 amps

• 105 amps

• 120 amps