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Concept explainers
a.
To find: the slope of L.
a.
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Answer to Problem 68RE
Slope of L is -1.
Explanation of Solution
Given information: Consider the point
Formula used:
The equation of the line having slope m, and y −intercept b is:
Calculation:
Equation of the line L is:
Therefore, slope of L is -1.
b.
To write: an equation for the line through P and parallel to L.
b.
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Answer to Problem 68RE
An equation for the line through P and parallel to L is
Explanation of Solution
Given information:
Formula used:
The equation of the line having slope m and passes through
Calculation:
Equation of the line L is:
Parallel lines have the same slope so the line parallel to line L also have slope -1.
Therefore, the equation of the line having slope -1 and passes through
Therefore, the equation for the line through P and parallel to L is
c.
To write: an equation for the line through P and perpendicular to L.
c.
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Answer to Problem 68RE
An equation for the line through P and Perpendicular to L is
Explanation of Solution
Given information:
Formula used:
The equation of the line having slope m and passes through
Calculation:
Equation of the line L is:
Perpendicular lines have the negative reciprocal slope so the line Perpendicular to line L has slope negative reciprocal of (-1) that is 1.
Therefore, the equation of the line having slope 1 and passes through
Therefore, the equation for the line through P and Perpendicular to L is
d.
To find: the x-intercept of L.
d.
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Answer to Problem 68RE
The x-intercept of L is 2.
Explanation of Solution
Given information: The equation of line L is
Calculation:
The equation of line L is:
Therefore, the x-intercept of L is 2.
Chapter 1 Solutions
Calculus 2012 Student Edition (by Finney/Demana/Waits/Kennedy)
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