To graph a function in MathCad:
*Click somewhere to get a red +
* type in the function, such as sin(2*x)
*while cursor is still within function, select Insert-Graph-X-Y Plot (a blank plot appears)
*Click off the plot, and it should no longer be blank
The limits on the axes can be changed by clicking on the plot, then clicking on the min or max values below or to the left of the plot, then changing them.

To graph a function which changes in the middle:
*Click somewhere to get a red +
*Type x:xmin, xmin+step;xmax <ENTER>
        for example x:1,1.01;5 will set x values from 1 to 5 in steps of 0.01
*Type y:ymin, ymin+step;ymax <ENTER>
        ymin should = xmax for continuing curve
*select Insert-Graph-X-Y Plot (a blank plot appears)
*Click on the black rectangle on the left of the plot and type your first function as a function of  x, followed by spacebar and comma, then the 2nd function as a function of y
        for example 2*x<SPACEBAR>,3*y
*Click on the black rectangle on the bottom of the plot and type  x, y
*Click off the plot, and it should no longer be blank