Key learning points

1. If two equations are written in the form y = mx + c then you can identify if they are perpendicular.
2. If the equations are not in that form, you can rearrange them to be.
3. From their graphs, you can identify whether two lines are perpendicular.

Common misconception

Keywords

• Perpendicular - Two lines are perpendicular if they meet at right angles.

• Irrational number - An irrational number is one that cannot be written in the form a/b where a and b are integers and b is not equal to 0

• Surd - A surd is an irrational number expressed as the root of a rational number.

• Radical - The root sign is the radical symbol.