Graphing - High School Math

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Question

The equation of a line is .

What are the slope and the y-intercept?

Answer

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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Question

What is the slope of the line ?

Answer

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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Question

What is the slope of the line that contains the points

and

Answer

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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Question

What is the slope of the line that contains the points and ?

Answer

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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Question

What is the y-intercept of the line ?

Answer

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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Question

Graph the point .

Answer

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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Question

Graph the point .

Answer

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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Question

Graph the point

Answer

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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Question

What point is depicted here?

Question_2

Answer

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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Question

Which set of three points falls on the line ?

Answer

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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Question

If the equation of a line is , what is the y-intercept?

Answer

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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Question

What is the slope of the line .

Answer

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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Question

What is the y-intercept of the line ?

Answer

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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Question

What is the slope of a line that is parallel to ?

Answer

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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Question

What is the slope of a line that is perpendicular to ?

Answer

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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Question

Define the point based on the coordinate plane.

Number_3

Answer

The point resides in quadrant I (the upper right quadrant), so both values must both be positive. The only possible solution is .

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Question

What is the slope of the line with the equation ?

Answer

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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Question

What is the slope of the line ?

Answer

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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Question

What is the y-intercept of the line ?

Answer

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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Question

What is the slope of a line that is parallel to ?

Answer

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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