The variables x and y vary directly. use the values to find the constant of proportionality, k. then write an equation that relates x and y. write any fractions in simplest form. y=45; x=40

The constant of proportionality s 9/8 and the required equation that relates x and y will be

If the variable x varies directly as the variable y, this is expressed using the equation below:

k is the constant of proportionality

Given that y = 45 and x = 40

Substitute the given parameters into the expression to have:

Hence the required equation that relates x and y will be

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1/8 3/16 3/4

step-by-step explanation:

you put them as all the same denominator and multiply

answer: 8 years

step-by-step explanation:

the explanation is that in 8 years the child will be 20 and in 8 years the father will be 40 and 20 is half of 40.