Add the following accessor method to your Line class:
public double getSlope ( )
Returns the slope of this Line. The slope of a line between points (x1, y1) and (x2, y2) is equal to (y2 − y1) / (x2 − x1). If x2 equals x1 the denominator is zero and the slope is undefined, so you may throw an exception in this case.
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