GRE Math : Other Lines

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Example Questions

Example Question #1 : How To Find The Slope Of A Line

Refer to the following graph:

Gre1

What is the slope of the line shown?

Possible Answers:

1/3

–3

–1/3

–1

Correct answer:

–3

Explanation:

One can use either the slope formula m = (y₂ – y₁)/(x₂ – x₁) or the standard line equation, y = mx + b to solve for the slope, m. By calculation or observation, one can determine that the slope is –3.

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Example Question #1 : How To Find The Slope Of A Line

What is the slope of the equation 4x + 3y = 7?

Possible Answers:

–4/3

–3/4

4/3

3/4

–7/3

Correct answer:

–4/3

Explanation:

We should put this equation in the form of y = mx + b, where m is the slope.

We start with 4x + 3y = 7.

Isolate the y term: 3y = 7 – 4x

Divide by 3: y = 7/3 – 4/3 * x

Rearrange terms: y = –4/3 * x + 7/3, so the slope is –4/3.

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Example Question #31 : Lines

What is the slope of the equation -2x+4y=8 ?

Possible Answers:

$-\frac{1}{2}$

$\frac{1}{2}$

Correct answer:

$\frac{1}{2}$

Explanation:

To find the slope of a line, you should convert an equation to the slope-intercept form. In this case, the equation would be $y=\frac{1}{2}x+2$ , which means the slope is $\frac{1}{2}$ .

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Example Question #1 : Other Lines

What is the slope of the line 3x+2y=5 ?

Possible Answers:

$\small \frac{2}{3}$

$\small \frac{3}{2}$

$\small -\frac{3}{2}$

Correct answer:

$\small -\frac{3}{2}$

Explanation:

To find the slope, put the equation in slope-intercept form $\small (y=mx+b)$ . In this case we have $y=-\frac{3}{2}+5$ , which indicates that the slope is $-\frac{3}{2}$ .

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Example Question #2 : How To Find The Slope Of A Line

What is the slope of a line passing through the point (12,-4) , if it is defined by:

y=mx+7 ?

Possible Answers:

$\frac{-1}{7}$

$\frac{-11}{12}$

$\frac{-7}{12}$

$\frac{11}{12}$

$\frac{12}{7}$

Correct answer:

$\frac{-11}{12}$

Explanation:

Since the equation is defined as it is, you know the y-intercept is . This is the point (0,7) . To find the slope of the line, you merely need to use the two points that you have and find the equation:

$\frac{rise}{run}=\frac{-4-7}{12-0}=\frac{-11}{12}$

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Example Question #31 : Coordinate Geometry

Line1

Which of the following could be an equation for the red line pictured above?

Possible Answers:

y=5x-4

y=-4x-2

y=15x+12

y=4x+3

y=-3x+3

Correct answer:

y=-3x+3

Explanation:

There are two key facts to register about this drawing. First, the line clearly has a negative slope, given that it runs "downhill" when you look at it from left to right. Secondly, it has a positive y-intercept. Therefore, you know that the coefficient for the term must be negative, and the numerical coefficient for the y-intercept must be positive. This only occurs in the equation y=-3x+3 . Therefore, this is the only viable option.

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Example Question #4 : How To Find The Slope Of A Line

What is the slope of a line defined by the equation:

14x-3y+3=10x+4y-10

Possible Answers:

$\frac{4}{7}$

$\frac{7}{10}$

$-\frac{4}{7}$

$-\frac{10}{7}$

$\frac{5}{6}$

Correct answer:

$\frac{4}{7}$

Explanation:

A question like this is actually rather easy. All you need to do is rewrite the equation in slope intercept form, that is:

y=mx+b

Therefore, begin to simplify:

14x-3y+3=10x+4y-10

Becomes...

-3y-4y=10x-14x-10-3

Then...

-7y=-4x-13

Finally, divide both sides by :

$y=\frac{4x}{7}+\frac{13}{7}$

The coefficient for the term is your slope: $\frac{4}{7}$

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Example Question #5 : How To Find The Slope Of A Line

What is the slope of line 3 = 8y - 4x?

Possible Answers:

-2

0.5

-0.5

Correct answer:

0.5

Explanation:

Solve equation for y. y=mx+b, where m is the slope

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Example Question #221 : Geometry

Find the slope of the line 6X – 2Y = 14

Possible Answers:

-3

-6

Correct answer:

Explanation:

Put the equation in slope-intercept form:

y = mx + b

-2y = -6x +14

y = 3x – 7

The slope of the line is represented by M; therefore the slope of the line is 3.

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Example Question #6 : How To Find The Slope Of A Line

If 2x – 4y = 10, what is the slope of the line?

Possible Answers:

–2

–0.5

–5/2

0.5

Correct answer:

0.5

Explanation:

First put the equation into slope-intercept form, solving for y: 2x – 4y = 10 → –4y = –2x + 10 → y = 1/2*x – 5/2. So the slope is 1/2.

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GRE Math : Other Lines

Study concepts, example questions & explanations for GRE Math

All GRE Math Resources

Example Questions

Example Question #1 : How To Find The Slope Of A Line

Example Question #1 : How To Find The Slope Of A Line

Example Question #31 : Lines

Example Question #1 : Other Lines

Example Question #2 : How To Find The Slope Of A Line

Example Question #31 : Coordinate Geometry

Example Question #4 : How To Find The Slope Of A Line

Example Question #5 : How To Find The Slope Of A Line

Example Question #221 : Geometry

Example Question #6 : How To Find The Slope Of A Line

All GRE Math Resources

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