Identifying Direct Proportion

Upon seeing, "y varies directly as x" we immediately.....

• write down what x and y are

• write down what k is equal to

• substitute into the equation

• write y = kx

Tags

CCSS.7.RP.A.2

CCSS.7.RP.A.3

CCSS.7.EE.B.4

How do you determine if a table represents a direct proportion?

• You check a few of the ratios of y/x or output/input to see if they are equal.

• You see if the ratios of input/output or x/y are equal

• You see if they all look to be the same and take a guess.

• You check ALL of the ratios of y/x or output/input and make sure that they are equivalent to the same number.

Tags

CCSS.7.RP.A.2A

Two slices of Dan’s Famous Pizza have 300

Calories. How many Calories would you expect to be in 6 slices of the same pizza?

• 30 calories

• 900 calories

• 1200 calories

• 460 calories

Tags

CCSS.6.RP.A.3B

A cake recipe calls for 1.5 cups of milk and 3 cups of flour. Seth made a mistake and used 12 cups of flour. How many cups of milk should he use to keep the proportions correct?

• 6 cups milk

• 3 cups milk

• 5.5 cups milk

• 9 cups milk

Tags

CCSS.7.RP.A.2A

Every 30 seconds, you can text 35 words. How many words can you type in 5 mins?

• 1200

• 350

• 1000

• 1,800

Tags

CCSS.7.EE.B.3

Lisa can fold 48 paper stars in 2 hours.

How many stars can she fold in 3 h?

• 48

• 72

• 24

• 96

Tags

CCSS.6.RP.A.3B

6 cats eat 1 kg of fish. How many kilograms of fish do you need to feed 18 cats?

• 18 kg

• 12 kg

• 6 kg

• 3 kg

Tags

CCSS.4.MD.A.2

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

Tags

CCSS.7.RP.A.2

CCSS.7.RP.A.3

The ratio of boys to girls in history class is 4 to 5. How many girls are in the class if there are 12 boys in the class?

• 12 girls
• 15 girls
• 5.3 girls
• 27 girls

Tags

CCSS.7.RP.A.2

CCSS.7.RP.A.3

Which of the following table shows a direct proportion relationship?

• 
• 
• 
• 

Tags

CCSS.7.RP.A.2B