Variation

Question 1

direct proportional

Answer 1

z∝ x

z = kx

Question 2

inverse proportion

Answer 2

z ∝ 1/x

z = k/x

Question 3

direct proportion graph

Answer 3

graph containing z and x will be linear and pass through the origin, and has a gradient equal to k

Question 4

inverse proportion graph

Answer 4

doesn’t pass through the origin, and forms a reciprocal curve

Question 5

ratio

Answer 5

used to describe a fraction

Question 6

proportion

Answer 6

a statement that two ratios are equal

can be direct or inverse