Question

Which equations show direct variation between x and y? Choose all answers that are correct. a 3x=7 b y=4.2/x c y/x=6 d y=0.5x + 9

Answer 1

a).  No.  Variation in 'y' has no effect on 'x'.

b).  No.  Variation in 'x' has exactly the opposite effect on 'y'.

c).  Yes.  Variation in 'x' causes 'y' to vary 6 times as much in the same direction.

d).  No.  Doubling 'x' does not double 'y'.