If two quantities vary directly, which must be true of a graph showing the relationship between them? Select all that apply.
a) The points of the graph form a straight line.
b) The points must all form equivalent ratios.
c) The points on the graph are connected.
d) The graph is a curve.
e) The graph increases from left to right.
f) The points of the graph must include the origin.
A for sure
what else?
hint: y = kx for some value of k.