\graph
\multigraph

Description

These macros provide a way of embedding a graph in any question. The graph will have center at the origin, x- and y-axes, and horizontal and vertical gridlines. The axes will be labelled at each gridline.

The \graph macro plots one function, while \multigraph allows for plotting of two functions on the same set of axes.

Syntax

\graph[gridlines]{formula}[xfmt]{xMin}{xMax}[yfmt]{yMin}{yMax}
gridlines option
Number of horizontal and vertical gridlines. Default is 10.
formula
Formula of the function in calculator syntax, not TeX.
xfmt option
Format of the number labels along the x-axis (see below).
xMin
Minimum x value on the x-axis.
xMax
Maximum x value on the x-axis.
yfmt option
Format of the number labels along the y-axis (see below).
yMin
Minimum y value on the y-axis.
yMax
Maximum y value on the y-axis.
\multigraph[gridlines]{formula1}{formula2}[xfmt]{xMin}{xMax}[yfmt]{yMin}{yMax}
gridlines option
Number of horizontal and vertical gridlines. Default is 10.
formula1
Formula of one function in calculator syntax, not TeX.
formula2
Formula of another function in calculator syntax, not TeX.
xfmt option
Format of the number labels along the x-axis (see below).
xMin
Minimum x value on the x-axis.
xMax
Maximum x value on the x-axis.
yfmt option
Format of the number labels along the y-axis (see below).
yMin
Minimum y value on the y-axis.
yMax
Maximum y value on the y-axis.

Notes

Examples

\begin{question}{Multi Formula}
\qutext{What are the $x$-intercepts of the graph shown: 
% Format: \graph[gridlines]{formula}[xfmt]{xMin}{xMax}[yfmt]{yMin}{yMax}
\graph[12]{(x-1)(x+3)}{-6}{6}{-6}{6}}
% The choice of gridlines and scale here will ensure that the axes are 
% labelled at the integers -6, -5, ..., -1, 1, ..., 5, 6.
\answer{1;-5}
\end{question}
\begin{question}{Numeric}
\qutext{Find the slope of the line graphed below.
\graph{200000*x + 50000}{-10}{10}[0.###E0]{-5000000}{5000000}}
\answer{200000}
\err{10000}
\end{question}