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BJP5 Exercise 8.15: getSlopeLine

Author: Marty Stepp (on 2019/09/19)

Add the following method to your Line class from the previous exercise:

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 the two points have the same x-coordinates, the denominator is zero and the slope is undefined, so you should throw an IllegalStateException in this case.

(You don't need to write the class header or declare the fields; assume that this is already done for you. Just write the method's complete code in the box provided.) See the previous exercise for a description of the Line class and its public members.

Type your solution here:

This is a partial class problem. Submit code that will become part of an existing Java class as described. You do not need to write the complete class, just the portion described in the problem.

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