SOLUTION: Find the value of k if the line joining (4, k) and (6, 8) and the line joining (-1, 4) and (0, 8) are a.) parallel, b.) perpendicular

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Question 983535: Find the value of k if the line joining (4, k) and (6, 8) and the line joining (-1, 4) and (0, 8) are a.) parallel, b.) perpendicular
Answer by solver91311(24713) About Me  (Show Source):
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Use the slope formula:



If the two lines are parallel, the two slopes must be equal, so set the two slopes equal to each other and solve for .

If the lines are perpendicular, their slopes are negative reciprocals. Set one slope equal to the negative reciprocal of the other and solve for .

John

My calculator said it, I believe it, that settles it