Direct Variation Quiz

What is the equation form used to represent direct variation?

• y = kx

• y = k + x

• y = x/k

• y = mx + b

In a direct variation, what does the constant 'k' represent?

• The y-intercept

• The slope of the line

• The constant of proportionality

• The x-intercept

If a pool's water level rises from 2 to 4 inches in 5 to 10 minutes, what is the rate of change?

• 0.2 inches per minute

• 0.4 inches per minute

• 0.6 inches per minute

• 0.8 inches per minute

How much does Julio earn per hour if his earnings are represented by the equation y = 10x?

• $15

• $10

• $5

• $20

What is the constant of proportionality in the equation y = 55x?

• 105

• 55

• 15

• 5

Why is the pizza pricing scenario not a direct variation?

• It is a straight line

• It does not have a constant ratio

• It passes through the origin

• It has a constant ratio

If 2 pounds of cheese cost $8.40, what is the cost per pound?

• $2.10

• $3.20

• $4.20

• $5.20

What is the constant of proportionality if 12/1, 24/2, 36/3, and 48/4 all equal the same value?

• 8

• 6

• 12

• 10

Which of the following is a characteristic of a direct variation?

• It does not pass through the origin

• It has a variable ratio

• It is a curved line

• It has a constant ratio

What is the equation for a direct variation if the constant of proportionality is 12?

• y = 12 - x

• y = x/12

• y = 12 + x

• y = 12x