Question 807626
y = mx + b is the slope intercept form of a line.  m is the slope, b is the y intercept.<P>
y = 3x is a line with a positive slope.  It angles up away from the x axis.<P>
If the slope is 0, the equation is y=0x which is y=0.<P>
That graph is the x-axis.<P>
Below, y=3x is the red line.  y=0 is the green line.
{{{ graph( 300, 200, -6, 5, -10, 10, 3x, 0) }}}