# Mathematics for Chemistry/Plotting graphs

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## The properties of graphs[edit | edit source]

The most basic relationship between two variables and is a straight line, a *linear relationship*.

The variable is the gradient and is a constant which gives the intercept. The equations can be more complex than this including higher powers of , such as

This is called a *quadratic equation* and it follows a shape called a parabola. High powers of can occur giving *cubic*, *quartic* and *quintic* equations. In general, as the power is increased, the line mapping the variables wiggles more, often cutting the -axis several times.

### Practice[edit | edit source]

Plot between -3 and +2 in units of 1.

Plot between -4 and +1 in units of 1.

Plot between -5 and +4 in units of 1.