Evaluating an expression with variables
Quick Graph allows you to evaluate mathematical expressions that has variables as part of the expression.
With x=3, the expression 7x + 4 becomes 7 * 3 + 4 which is equal to 21 + 4 or 25. Figure 6 shows an example about how to evaluate an expression with a variable using Quick Graph.
Its important to notice that you have to enter the evaluation point first and then the equation, separated by a semicolon (;)