If you mean: (9, -12) then the equation is y = -12 which is a straight line parallel to the x axis passing through (0, -12)
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If the equation of a line is in the form ax + by + c = 0 then the slope of the line will be -a/b.
y = 0. You can get this from the slope-intercept equation of the line.
the slope is 0
The slope equation is y = mx + b where m is slope for y = 3 we have y = 0 (x) +3 so m = 0 = slope So slope is zero line is constant y = 3
Since the equation y = -4 represents a horizontal line, then the slope of the line is 0.