Direct and inverse proportion – table and graph

MathematicsAlgebraAges 12–13

A table of values and the graph of y = kx (direct proportion) or y = k/x (inverse proportion). Drag the point on the graph horizontally to change x and watch y change with it; drag vertically to change the constant k. The table below shows the ratio y/x (always equal to k) or the product x·y (always equal to k), helping students spot the signature of each type of relationship.