Specify Equations in Graphing Question Answer Keys

When you use line , circle , parabola , or region in your graphing question answer key, you have the option of specifying an equation for the key. You can use the following notation in your equations.

ReferenceInstructor HelpWebAssign

Expression	Notation	Examples
Math variables	The only allowed variables in graphing question answer keys are `x` and `y`.	`line: y=x+1`
Addition	`+`	`line: y=x+1`
Subtraction	`-`	`line: y=x-1`
Multiplication	`*` You must use explicit multiplication.	`line: y=x*2`
Division or fractions	`/`	`line: y=x/4`
Exponentiation	`^` Ensure that your equation specifies a linear, circular, or parabolic function.	`parabola: y=x^2 circle:(x-1)^2+(y+3)^2=25`
Equality	`=`	`line: y=x+1`
Inequality	`> < >= <=`	`region: y>x+1 region: y<x+1 region: y>=x^2+3*x+1 region: (x-1)^2+(y+3)^2<=25`
Order of Operations	`()`	`circle:(x-1)^2+(y+3)^2=25`
Pi (π)	`pi` Substituting 3.14 only approximates this value.	`parabola: y=pi*x^2`