The slope of the line y = -2 is zero.
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y=2 is actually a horizontal line. x=2 is vertical.
The line Y=2 is a horizontal line at positive 2..So the Y intercept is 2.Think of a normal line equation.Y=mX+bB is the y intercept, and since there is no "mx" term, m, which is the slope, equals 0, which means it's a horizontal line.
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-2
y equals 4x+1 is a parallel line to y equals 4x.