Dual Intercept Method
Dual intercept method
Only two points are needed to plot a straight line graph. The easiest points to use are the \(x\)-intercept and the \(y\)-intercept.
Example
Question
Sketch the graph of \(g(x)=x-1\) using the dual intercept method.
Examine the standard form of the equation
\(m>0\). This means that the graph increases as \(x\) increases.
Calculate the intercepts
For the \(y\)-intercept, let \(x=0\); therefore \(g(0)=-1\). This gives the point \((0;-1)\).
For the \(x\)-intercept, let \(y=0\); therefore \(x=1\). This gives the point \((1;0)\).
Plot the points and draw the graph
This lesson is part of:
Functions I
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