Key learning points

1. If you have one value, you can use a linear graph to find its pair.
2. The pair of values will satisfy the linear equation.
3. If the x and y variables have context, then their values can be interpreted within that context.
4. With quadratic graphs, there may be more than one value to find.

Common misconception

Keywords

• Linear - The relationship between two variables is linear if, when plotted on a pair of axes, a straight line is formed.

• Quadratic - A quadratic is a an equation, graph, or sequence whereby the highest exponent of the variable is 2.

• Parabola - A parabola is a curve where any point on the curve is an equal distance from a fixed point (the focus) and a fixed straight line (the directrix).