# Unit Quiz: Direct and Inverse Proportion

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## Q1. 1. A
2. B
3. C

1. B

## Q2. 1. A
2. B
3. C

1. A

## Q3. ### Options:

1. x = 60 and z = 3
2. x = 160 and z = 9
3. x = 10 and z = 81

1. x = 160 and z = 9

1. 5 pence
2. 20 pence
3. £3.20
4. £4.80

1. £3.20

## Q5. 1. A
2. B
3. C

1. B

## Q6. 1. A
2. B
3. C

1. C

## Q7.1. y is directly proportional to x and x is inversely proportional to z². y = 20 when x = 5 and z = 2 when x = 3 Find a formula for y in terms of x. 1. A
2. B
3. C
4. D

1. B

## Q8.2. y is directly proportional to x and x is inversely proportional to z². y = 20 when x = 5 and z = 2 when x = 3 Find a formula for x in terms of z² 1. A
2. B
3. C
4. D

1. C

## Q9.3. y is directly proportional to x and x is inversely proportional to z². y = 20 when x = 5 and z = 2 when x = 3 Find the value of y when z = 4 1. A
2. B
3. C
4. D

1. A

## Q10.y is inversely proportional to 𝑥. Given that y = 2 when 𝑥 = 3, find a formula for y in terms of 𝑥. 1. A
2. B
3. C
4. D

1. D

## Q11.y is inversely proportional to 𝑥. Given that y = 2 when 𝑥 = 3, what is the value of y when 𝑥 = 4? 1. A
2. B
3. C
4. D

1. A

## Q12.y is inversely proportional to 𝑥. Given that y = 2 when 𝑥 = 3, what is the value of 𝑥 when y = 12? 1. A
2. B
3. C
4. D

1. C

## Q13.y is inversely proportional to 𝑥². Given that y = 9 when 𝑥 = 2, what is the value of y when 𝑥 = 6? 1. A
2. B
3. C
4. D