Question

Given that y varies directly with x, write the linear function relating the two variables if y =8 when x=4

Answer 1

Y varies Directly with X

So the equation is Y = kX

Now we have to find what k is which the "constant of proportionality".

For that you have been given y = 8 when x = 4

So write 8 = k.4; this gives k = 2

rewrite the equation now, Y = 2X; that's your answer