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The equation of a line is .
What are the slope and the y-intercept?
The equation of the line is written in slope-intercept form, , where
is the slope and
is the y-intercept. In this example, the y-intercept is a negative number.
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What is the slope of the line ?
In the standard form of a line the slope is represented by the variable
.
In this case the line has a slope of
.
The answer is .
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What is the slope of the line that contains the points
and
To find the slope of a line with two points you must properly plug the points into the slope equation for two points which is
We must then properly assign the points to the equation as and
.
In this case we will make our
and
our
.
Plugging the points into the equation yields
Perform the math to arrive at
The answer is .
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What is the slope of the line that contains the points and
?
To find the slope of a line with two points we must properly plug the points into the slope equation:
We must then assign the variables and
.
In this case we will plug in for
and
for
.
Plugging the points into the equation yields .
Perform the math to arrive at .
The answer is.
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What is the y-intercept of the line ?
The y-intercept is the point at which the line intersects the y-axis.
It does this at .
We plug in for
in our equation,
, to give us
.
Anything multiplied by is
, so
.
Our coordinates for the y-intercept are .
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Graph the point .
The first number in the ordered pair indicates how far left or right the point resides from the origin. The second number in the ordered pair indicates how far up or down the point resides from the origin. Numbers that are positve are located on the right side and above the origin while negative numbers are located to the left of or below the origin. This point resides to 2 units to the right and 1 unit above the origin.
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Graph the point .
The first number in the ordered pair indicates how far left or right the point resides from the origin. The second number in the ordered pair indicates how far up or down the point resides from the origin. Numbers that are positve are located on the right side and above the origin while negative numbers are located to the left of or below the origin. This point is located 3 units to the left and 7 units above the origin.
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Graph the point
The first number in the ordered pair indicates how far left or right the point resides from the origin. The second number in the ordered pair indicates how far up or down the point resides from the origin. Numbers that are positve are located on the right side and above the origin while negative numbers are located to the left of or below the origin.This point is located 4 units to the right and 5 units below the origin.
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The point resides in quadrant 1, indicating that both the x-value and y-value are positive. The point is given by , where
is the number of horizontal units and
is the number of vertical units. The image depicts a point that is
units to the right and
units up; therefore
is the correct answer.
Remember that movement to the right or up is positive, while movement to the left or down is negative.
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Which set of three points falls on the line ?
To determine which set of points is correct, substitute each of the values into the equation and determine if the equation is true.
Correct points:
Incorrect points:
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If the equation of a line is , what is the y-intercept?
In the slope-intercept form of a line, , the y-intercept when the line intersects the y-axis.
It does this at .
So we plug in for
in our equation
to give us
.
Anything multiplied by is
so
.
Our coordinates for the y-intercept are .
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What is the slope of the line .
In the standard form of a line the slope is represented by the variable
.
In this case the line has a slope of
.
The answer is .
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What is the y-intercept of the line ?
In the standard form of a line the y-intercept occurs when the line intersects the y-axis.
It does this at
So we plug in for
in our equation
to give us
.
Anything multiplied by is
so
.
Our coordinates for the y-intercept are .
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What is the slope of a line that is parallel to ?
Parallel lines have the same slope.
If an equation is in point-slope form, , we take the
from our equation and set it equal to the slope of our parallel line.
In this case
The slope of our parallel line is .
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What is the slope of a line that is perpendicular to ?
The slope of a perpendicular lines has the negative reciprocal of the slope of the original line.
If an equation is in point-slope form, , we use the
from our equation as our original slope.
In this case
First flip the sign to get .
To find the reciprocal you take the integer and make it a fraction by placing a over it. If it is already a fraction just flip the numerator and denominator.
Do this to make the slope
The slope of the perpendicular line is .
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What is the slope of the line with the equation ?
In the standard form equation of a line, , the slope is represented by the variable
.
In this case the line has a slope of
.
Therefore the answer is .
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What is the slope of the line ?
In the slope-intercept form of a line, , the slope is represented by the variable
.
In this case the line
has a slope of .
The answer is .
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What is the y-intercept of the line ?
In the slope-intercept form of a line, , the y-intercept is when the line intersects the y-axis.
It does this at .
So we plug in for
in our equation
to give us
Anything multiplied by is
so
Our coordinates for the y-intercept are .
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What is the slope of a line that is parallel to ?
Parallel lines have the same slope.
If an equation is in slope-intercept form, , we take the
from our equation and set it equal to the slope of our parallel line.
In this case .
The slope of our parallel line is .
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