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\n" ); document.write( "This equation is in slope-intercept form, y=ax+b, with a=1 and b = -4:
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\n" ); document.write( "In this form, the a is the slope and the b is the y-intercept.
\n" ); document.write( "The intercept -- or more precisely, the y-intercept, is where the graph crosses the y-axis. Since everywhere on the y-axis the x value is 0, the y-intercept is the value of the function when x is 0:
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\n" ); document.write( "The y-intercept is -4, or (0,-4).
\n" ); document.write( "So start your graph by marking the point (0,-4) on your graph.
\n" ); document.write( "The slope, a=1, tells you how much the graph rises (positive slope) or falls (negative slope) each time you \"take one step forward\" -- i.e., move 1 to the right. So a slope of 1 tells you that each time you move 1 to the right, the graph moves up 1.
\n" ); document.write( "So starting at your y-intercept of (0,-4), repeatedly move right 1 and up 1 to plot another point, until you have enough points to make a relatively accurate line.
\n" ); document.write( "Or you could just go 5 to the right and up 5 and plot just one more point.
\n" ); document.write( "When you have enough points, draw the line containing all the points. Remember that the line continues infinitely in both directions; it doesn't just contain the points you plotted. \n" ); document.write( "