Which proportions show that the triangles are not similar?

You can use proportion
AB/BC = 3/2
DE/EF = 4/3

3/2 is not equal 4/3
so the triangles are not similar

Ifound this on google “that means that the graph of a function with direct variation has these features: it is a straight line: because the slope is the ratio y/x = k. it passes through the origin (0,0): because y = kx = k (0) = 0.” i hope this you for what your looking for