GRE Math : Other Lines

Study concepts, example questions & explanations for GRE Math

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例子Questions

例子Question #114 :Coordinate Geometry

What is the slope of the line with equation 4x– 16y= 24?

Possible Answers:

1/4

–1/4

1/8

–1/8

1/2

Correct answer:

1/4

Explanation:

The equation of a line is:

y=mx+b, wheremis the slope

4x– 16y= 24

–16y= –4x+ 24

y= (–4x)/(–16) + 24/(–16)

y= (1/4)x– 1.5

Slope = 1/4

例子Question #115 :Coordinate Geometry

What is the slope of a line which passes through coordinates\dpi{100} \small (3,7)and\dpi{100} \small (4,12)?

Possible Answers:

\dpi{100} \small \frac{1}{2}

\dpi{100} \small 3

\dpi{100} \small 5

\dpi{100} \small \frac{1}{5}

\dpi{100} \small 2

Correct answer:

\dpi{100} \small 5

Explanation:

Slope is found by dividing the difference in the\dpi{100} \small y-coordinates by the difference in the\dpi{100} \small x-coordinates.

\dpi{100} \small \frac{(12-7)}{(4-3)}=\frac{5}{1}=5

例子Question #116 :Coordinate Geometry

What is the slope of the line represented by the equation6y-16x=7?

Possible Answers:

\frac{8}{3}

16

-16

6

\frac{7}{6}

Correct answer:

\frac{8}{3}

Explanation:

To rearrange the equation into ay=mx+bformat, you want to isolate theyso that it is the sole variable, without a coefficient, on one side of the equation.

First, add11xto both sides to get6y=7+16x.

Then, divide both sides by 6 to gety=\frac{7+16x}{6}.

If you divide each part of the numerator by 6, you gety=\frac{7}{6}+\frac{16x}{6}. This is in ay=b+mxform, and themis equal to\frac{16}{6}, which is reduced down to\frac{8}{3}for the correct answer.

例子Question #117 :Coordinate Geometry

What is the slope of the given linear equation?

2x + 4y = -7

Possible Answers:

1/2

-2

-7/2

-1/2

Correct answer:

-1/2

Explanation:

We can convert the given equation into slope-intercept form, y=mx+b, where m is the slope. We get y = (-1/2)x + (-7/2)

例子Question #118 :Coordinate Geometry

What is the slope of the line:

Possible Answers:

Correct answer:

Explanation:

First put the question in slope intercept form (y = mx + b):

(1/6)y =(14/3)x7 =>

y = 6(14/3)x7

y = 28x7.

The slope is 28.

例子Question #119 :Coordinate Geometry

What is the slope of a line that passes though the coordinates(5,2)and(3,1)?

Possible Answers:

-\frac{1}{2}

-\frac{2}{3}

\frac{2}{3}

4

\frac{1}{2}

Correct answer:

\frac{1}{2}

Explanation:

The slope is equal to the difference between the y-coordinates divided by the difference between the x-coordinates.

Use the give points in this formula to calculate the slope.

例子Question #231 :Geometry

What is the slope of a line running through pointsand?

Possible Answers:

Correct answer:

Explanation:

The slope is equal to the difference between the y-coordinates divided by the difference between the x-coordinates.

Use the give points in this formula to calculate the slope.

例子Question #1 :How To Find Out If A Point Is On A Line With An Equation

Find the point where the liney= .25(x– 20) + 12 crosses thex-axis.

Possible Answers:

(–28,0)

(12,0)

(0,0)

(–7,0)

(0,–28)

Correct answer:

(–28,0)

Explanation:

When the line crosses thex-axis, they-coordinate is 0. Substitute 0 into the equation foryand solve forx.

.25(x– 20) + 12 = 0

.25x– 5 = –12

.25x= –7

x= –28

The answer is the point (–28,0).

例子Question #2 :How To Find Out If A Point Is On A Line With An Equation

On a coordinate plane, two lines are represented by the equationsand. These two lines intersect at point. What are the coordinates of point?

Possible Answers:

Correct answer:

Explanation:

You can solve for thewithin these two equations by eliminating the. By doing this, you get.

Solve forto getand plugback into either equation to get the value ofas 1.

例子Question #3 :How To Find Out If A Point Is On A Line With An Equation

If the two lines represented byandintersect at point, what are the coordinates of point?

Possible Answers:

Correct answer:

Explanation:

Solve forby setting the two equations equal to one another:

Pluggingback into either equation gives.

These are the coordinates for the intersection of the two lines.

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