Yis inversy proportional to x. when y=7 , x=9 a) work out an equation connecting y and x? b) work out the value of y when x=21

see explanation

Step-by-step explanation:

since y is inversely proportional to x the equation relating them is

y = ← k is the constant of proportionality

to find k use the given condition when y = 7, x = 9

k = yx = 7 × 9 = 63

y = ← is the equation connecting them

when x = 21, then

y = = 3

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