CLSM9_ Direct and indirect proportions

What is the difference between direct and indirect proportions?

• Direct proportion means that as one variable increases, the other variable also increases. Indirect proportion means that as one variable increases, the other variable decreases.

• Direct proportion means that as one variable increases, the other variable remains constant. Indirect proportion means that as one variable increases, the other variable also remains constant.

• Direct proportion means that as one variable decreases, the other variable also decreases. Indirect proportion means that as one variable decreases, the other variable increases.

• Direct proportion means that as one variable increases, the other variable decreases. Indirect proportion means that as one variable increases, the other variable also increases.

If y is directly proportional to x, and y = 10 when x = 5, what is the value of y when x = 8?

• 20

• 12

• 5

• 16

If y is inversely proportional to x, and y = 15 when x = 3, what is the value of y when x = 5?

• y = 12

• y = 7

• y = 9

• y = 20

In a direct proportion, if x = 4 when y = 8, what is the value of y when x = 10?

• 15

• 5

• 20

• 25

In an indirect proportion, if x = 6 when y = 12, what is the value of y when x = 3?

• y = 6

• y = 24

• y = 18

• y = 2

If a car travels 200 miles in 4 hours, how long will it take to travel 300 miles at the same speed?

• 10 hours

• 6 hours

• 12 hours

• 8 hours

If 8 workers can build a wall in 6 days, how many workers are needed to build the same wall in 3 days?

• 12

• 4

• 24

• 16

If 15 students can finish a project in 10 days, how many days will it take for 25 students to finish the same project?

• 3 days

• 8 days

• 12 days

• 6 days