Asked by Sally
If the points (4,2) and )-1, k) are on a line that is perpendicular to the line y=2x+1, what is the value of k?
Answers
Answered by
R_scott
the slope of the given line is 2 ... y = m x + b , m is the slope
perpendicular lines have negative-reciprocal slopes
... so the new line slope is -1/2
(2 - k) / (4 - -1) = -1/2 ... solve for k
perpendicular lines have negative-reciprocal slopes
... so the new line slope is -1/2
(2 - k) / (4 - -1) = -1/2 ... solve for k
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