Question 1071417
Here's the graphs:
{{{ graph( 400, 400, -10, 10, -10, 10, x - 1, (-4/3)*x - 8 ) }}}
You can see the line with negative slope goes through
( -6, 0 ) and
( 0, -8 )
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The line with positive slope goes through
( 1, 0 ) and
( 0, -1 )
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All you need is 2 points to plot a line, so you are done
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Here's how to get ( -6, 0 )
Let {{{ y = 0 }}}
{{{ 0 = (-4/3)*x - 8 }}}
{{{ (4/3)*x = -8 }}}
{{{ x = (3/4)*(-8) }}}
{{{ x = -6 }}}
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Just follow this method