Question

The following table shows a proportional relationship between wand z.318z 2. 545819Write an equation to describe the relationship between w and z.

Answer 1

when w = 18 then z =2

take ratio,

k = 18/2

k = 9

when w =45 then z = 5

take ratio

k = 45/5

k = 9

now it is clear that the constant of proportionality is k = 2

so, the relation between w and z is

w = k z

put k = 9

w = 9z

so, the relation between w and z is w = 9z