A linear graph can be drawn using only three points ... Draw a horizontal line, using a ruler, from the curve across to the \(y\)-axis. Read the value on the \(y\)-axis. To find an \(x\)-value ...

A demand schedule can be graphed as a continuous demand curve on a chart where the Y-axis represents price and the X-axis represents quantity. Analysts can estimate the demand for a good at any ...

Plotting a graph takes time. Often mathematicians just want to know the key features. These are: shape, location and some key points (such as where the graph crosses the axes or turning points).