HP HP-28S - Plotting Equations

Plotting Equations
The examples in this chapter were both expressions, but the same
rules and techniques work for plotting equations. When the variable
EQ contains
an equation, DRAW plots each side of the equation as an
expression. You can find a root of the equation by finding where the
two graphs cross, because that is where the two sides of the equation
have equal values.
7: Plotting 97