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T IN SECONDS 0 10 20 40 50

HEIGHT IN M 30 45 60 90 105

HEIGHT IN M 30 45 60 90 105

A

Linear.

B

Directly proportional.

C

Linear nor directly proportional.

D

Both.

Choose right or wrong:

A

A linear formula is also directly proportional.

B

A linear formula is sometimes directly proportional.

C

A linear formula is never directly proportional.

D

Linear and directly proportional mean the same.

A directly proportional formula has no y-intercept.

A

True.

B

False.

A

The formula is:
H = 15T

B

The formula is:
T = 1.5H

C

The formula is:
H = 1.5T + 30

D

The formula is:
30 + 1.5H = T

Choose the right formula:

A

y = 3x + 4

B

y=−31x+4

C

y=31x+4

D

y = -3x + 4

What is the right formula?

The artist is ...

A

y = -8x + 1

B

y = 1/8 x + 1

C

y = 8x

D

y = 1/8 x - 1

The graph for y = -3 + 5x is

A

a straight horizontal line

B

a straight rising line

C

a vertical line

D

a straight falling line

Does (-12,-3) lie on the graph for

y = 2x + 21 ?

y = 2x + 21 ?

A

Yes, it does.

B

No, it does not.

Make a linear formula for a vertical line through point (-5, -7)

A

y = -7

B

x = -7

C

y = -5

D

x = -5

Make a linear formula for a horizontal line through point (-5, -7)

A

x = -7

B

x = -5

C

y = -5

D

y = -7

Mention something you've learnt this lesson.