Question

The variables x and y vary directly. Write an equation that relates x and y, when x = 4 and y = 2.

Answer 1

since x and y vary directly that means that the equaiton will be similar to this form

y=kx where k is the constant

or y=x/k


Not y=k/x >>> which means that y varies INDIRECTLY with x

Answer 2

so what is the relationship betwee the y=2 and x =4

y=x/k

2=4/k

so k=2

meaning

y=x/2 >>> the equaiton