SLOPE OF A LINE

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➣ QUESTION:

Given the points (-4, 3) and (-4, 5), find the slope of the line.

• A. -4
• B. 0
• C. undefined
• D. 1

➣ ANSWER:

The slope of the line is undefined.

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➣ SOLUTION:

» Given:

• = (-4, 3)
• = (-4, 5)

» Formula to use:

Formula for calculating the slope m of a line given two points.

» Solve.

• » undefined.

Therefore, the correct answer is letter C.

Here's a Tip!

• We can easily tell whether the slope of an equation of a line is undefined or not by inspecting the x-coordinates of the given two points. In an undefined slope, the trend of the x-coordinates does not change, meaning the x-coordinate is always the same no matter what the y-coordinate is. If the trend does change, the slope is not undefined.

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