Question 691614
By visualizing, I know if the y-intercept is on the positive y-axis, 
and the slope is positive, then the x-intercept is on the 
negative x-axis.
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The slope is ( change in y ) / ( change in x )
The intercepts are (0,4) and (x[1], 0)
{{{ ( 4 - 0 ) / ( 0 - x[1] ) = 2 }}}
{{{ 4 / (-x[1]) = 2 }}}
{{{ -x[1] = 2 }}}
{{{ x[1] = -2 }}}
The x-intercept is (-2,0)