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jacksonshalika
16.12.2019 •
Mathematics
Which point on the y-axis lies on the line that passes through point c and is perpendicular to line ab?
• (-6, 0 )
• ( 0, -6 )
• ( 0, 2 )
• ( 2, 0
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Ответ:
The line perpendicular to the line AB passes through the point
i.e.,
.
Further explanation:
From the given figure in the question it is observed that the line AB passes through the points
and
.
The coordinate for the point C is
.
Step1: Obtain the slope of the line AB.
The slope of a line which passes through the points
and
is calculated as follows:
It is given that the line AB passes through the points
and
.
To obtain the slope for the line AB substitute
for
,
for
,
for
and
for
in equation (1).
Therefore, the slope of the line AB is
.
Consider the slope of AB as,
so,
.
Step2: Obtain the slope of the perpendicular line.
The slope of line AB is
.
Consider a line which is perpendicular to the line AB passing through the point C. Assume the slope of the perpendicular line as
.
The product of slope of two mutually perpendicular lines is always equal to
.
The equation formed for the slope is as follows:
Substitute the value of
in the above equation.
Therefore, the slope of the perpendicular line is
.
Step3: Obtain the equation of the perpendicular line.
The slope for perpendicular line is
and the line passes through the point C. The coordinate for the point C are
.
The point slope form of a line is as follows:
Substitute
for
,
for
and
for
in the above equation.
Therefore, the equation of the perpendicular line is
.
Option 1:
In option 1 it is given that the line perpendicular to AB passes through the point
.
The equation of the line which is perpendicular to AB is
.
Substitute
for
in the above equation.
From the above calculation it is concluded that the line passes through the point
.
This implies that option 1 is incorrect.
Option 2:
In option 2 it is given that the line perpendicular to AB passes through the point
.
The equation of the line which is perpendicular to AB is
.
Substitute
for
in the above equation.
From the above calculation it is concluded that the line passes through the point
.
This implies that option 2 is incorrect.
Option 3:
In option 3 it is given that the line perpendicular to AB passes through the point
.
The equation of the line which is perpendicular to AB is
.
Substitute
for
in the above equation.
From the above calculation it is concluded that the line passes through the point
.
This implies that option 3 is correct.
Option 4:
In option 4 it is given that the line perpendicular to AB passes through the point
.
The equation of the line which is perpendicular to AB is
.
Substitute
for
in the above equation.
From the above calculation it is concluded that the line passes through the point
.
This implies that option 4 is incorrect.
Therefore, the line perpendicular to the line AB passes through the point
i.e.,
.
Learn more:
1.A problem on composite function link
2.A problem to find radius and center of circle link
3.A problem to determine intercepts of a line link
Answer details:
Grade: High school
Subject: Mathematics
Chapter: Lines
Keywords: Geometry, coordinate geometry, lines, equation, graph, curve, slope, perpendicular, point slope form, slope intercept form.
Ответ: