Question 1165939
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1)  y + 8 = 0   means  y = -8.

    The graph is horizontal line parallel x-axis 8 units below x-axis.



2)  x + 1 = 0  means  x = -1.

    The graph is vertical line parallel y-axis through the point x= -1.
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Is there something in my response that you do not understand ?



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By the way, the response by tutor @Boreal is partly incorrect.


In his plot, the green line should be 1 unit to the left from the vertical ahis y.