Mathematics - Ratios and Proportions - Direct and inverse proportion - Proportion Graph Explorer

Two modes: 'Direct' and 'Inverse'. In Direct mode: x slider (1-20) controls a bar for x and a proportional bar for y (with adjustable constant k). As x doubles, y doubles. Graph shows a straight line. In Inverse mode: as x increases, y decreases (xy=k). Graph shows a curve. The student adjusts k and