The equation for straight line graphs is y=mx+c. The m is the gradient. The c is the y-intercept. Using a a table of values can help make it easier to plot the graph.

Finding equations can be done with a graph and looking at the y-intercept. Use a gradient triangle to find the gradient. Put the gradient and the y-intercept into the equation. If an equation is in a different order, you can rearrange it.

When you are given one or two points, you can use algebra to figure out the equation.

1 point:

- Put the gradient into the equation.
- Put in the x and y values from the point.
- Solve the equation.

2 points:

- Draw a sketch showing the two points.
- Work out the gradient using the triangle.
- Use the method for 1 point to solve it.

## Comments

No comments have yet been made