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) (Show Source): You can put this solution on YOUR website!
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
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