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F3. Gradient and intercept : perpendicular lines The straight line, y=mx+c is plotted in red on the graph shown. A and B are two points anywhere on the line. Any line that is at right-angles (or 90 degrees) to this line is perpendicular to this line. Use your mouse to move A, B, C or D. Sorry, this page requires a Java-compatible web browser. The gradients of the red and blue lines are shown in red and blue respectively. Can you find a connection between these two values?