Study lines in the number plane. Consider the gradient and y-intercept and relate them to the equation of the line. Explore the effect of translation. Compare the two forms of the equation of a line.

Line Explorer
Investigate the slope, intercepts and equations of lines

Adjust the constraints and drag the points to explore the graphs and equations of a variety of lines.

Standard form:
Gradient-intercept form:

           

  

Interactively study straight lines


Enter an equation for a line:

Use the form ay = bx + c,
e.g. y = 2x - 5 or 3y = -x + 6