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In this lesson, we will learn how to write an equation to describe direct variation and use proportions to find other sets of values.

Q1:

A car moves at a uniform velocity and travels 240 km in 3 hours. If the car continues at the same velocity, what distance will be covered in 5 hours?

Q2:

If π₯ varies directly with π¦ and π₯ = 1 5 when π¦ = 2 5 , what is the value of π₯ when π¦ = 5 ?

Q3:

If π varies directly with π and π = 2 4 when π = 8 4 , find the value of π when π = 1 0 .

Q4:

Amir is 1.6 m tall, and his shadow is 4 m long. He is standing near a tree whose shadow is 22 m long.

How tall is the tree?

Q5:

Given that π varies directly with π , and π = 1 5 when π = 1 0 , write an equation for π in terms of π .

Q6:

Given that π¦ varies directly with π₯ , and π¦ = 4 when π₯ = 2 0 , write an equation for π¦ in terms of π₯ .

Q7:

Given that π varies directly with π , and π = 3 5 when π = 4 2 , write an equation for π in terms of π .

Q8:

Which table does NOT show π₯ varying directly with π¦ ?

Q9:

The length of a rectangle is 8 m and its width is 5 m. What is the perimeter of a similar rectangle with length 19 metres?

Q10:

Sameh works 37 hours a week and is paid $416.25. Given that , the amount in dollars that Sameh earns, varies directly with , the number of hours he works, write an equation for in terms of .

Q11:

The amount a babysitter earns varies directly with the number of hours they work. A babysitter earns $25.50 for 3 hours of babysitting.

How much would they earn for 2 hours of babysitting?

Write an equation for π€ , the number of dollars earned for π‘ hours of babysitting.

Q12:

The cost of hiring a small car for 4 days is $170. What would the cost to hire the car for a week at the same rate be? Give your answer to two decimal places if necessary.

Q13:

Use the data in the table to find the values of π and π .

Q14:

π¦ = π + π , where π is a constant and π varies directly with π₯ . Given that π¦ = 9 when π₯ = 2 , and π¦ = 4 when π₯ = 1 , what is the value of π¦ when π₯ = 9 .

Q15:

Given that π¦ β οΌ 1 π₯ ο t h e m u l t i p l i c a t i v e i n v e r s e o f 2 , and π¦ = 4 4 when π₯ = 2 , then find the value of π¦ when π₯ = 4 .

Q16:

Engy decided to make pizzas. The graph shows the number of tomatoes needed for a given number of pizzas.

Determine which of the following statements is true.

Q17:

The instructions on a packet of fertilizer state that 500 g will treat an area of 60 square meters if mixed correctly. How much fertilizer is needed to treat a garden whose area is 100 square meters? Give your answer to the nearest gram if necessary.

Q18:

π₯ and π¦ are two variables, where π¦ varies directly with the multiplicative inverse of οΌ 1 π₯ ο 3 . If π¦ = 3 5 when π₯ = 1 0 , determine the values of π¦ when π₯ β { 3 , 4 , 5 } .

Q19:

Given that π¦ β π₯ 2 3 , where π¦ = β 1 5 when π₯ = 7 , find the relation between π₯ and π¦ .

Q20:

Which of the following points represents the unit rate in the graph?

Q21:

A fixed menu at a restaurant costs $25 for two people. A group of 10 friends went to the restaurant, and everyone ordered the fixed menu.

How much was the check?

Q22:

Given that οΉ 3 8 π₯ + 9 π¦ ο β οΉ π₯ + 4 6 π¦ ο 2 2 , π₯ β β , and π¦ β β . Which of the following correctly expresses the relation.

Q23:

Farida prepared some mortar to repoint the joints of her garden brick wall. She filled of a small plastic tray with cement, put it in a large bucket, and then added trays of sand. Finally, she added water and mixed it all. How many trays of sand will she have to use if she wants to make mortar in the same proportions with one tray of cement?

Q24:

The graph shows how many tablespoons of sugar are needed to make a given number of glasses of lemonade.

Determine which of the following statements is NOT true.

Q25:

When making concrete, 20 kg of cement is used with 8 litres of water.

How much cement would be needed with 10 litres of water?

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