Question 772182
y=mx+b is a straight line with slope m and y-intercept b.  Plug in two x values, find corresponding y values.  Those are two points.  Draw a line through them.<P>
When x = 0, y = 1.  This line crosses the y axis at y=1.<P>
when y = 0, x = -2<P>
Plot those points, (0,1) and (-2,0).  Draw a line between them.<P>
{{{graph( 300, 200, -5, 5, -5, 5, (1/2)x +1)}}}