OpenStudy (anonymous):

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

OpenStudy (rajee_sam):

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