Y is inversely proportional to x.

When y = 7, x = 9

Work out an equation connecting y and x.

Work out the value of y when x = 21

see explanation

Step-by-step explanation:

Given that y is inversely proportional to x then the equation relating them is

y = ← k is the constant of proportionality

To find k use the condition that y = 7, x = 9

k = yx = 7 × 9 = 63, thus

y = ← equation of proportion

When x = 21, then

y = = 3

i would say the third one.

step-by-step explanation: liner would mean in a line and the only one that doesn't look like it's even thinking about forming a line would be the third one