Transform the equation into a more normal form, such as y = mx + b...
y - 7 = x + 4
y = x + 11
... Now, you can easily pick two points, such as (0,11) and (4,15) and draw a straight line through them. You are done.
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the line of symmetry would occur at x=0
It is a straight line with gradient -A/B and intercept C/B.
That is the standard equation to graph a line.
-2
This is the graph of a diagnol line. Range: (-infinity, infinity)