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ACT Math : Lines

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Example Questions

Example Question #41 : Coordinate Geometry

What is the slope of the line represented by the equation $6y-16x=7$ ?

Possible Answers:

$16$

$6$

$-16$

$\frac{8}{3}$

$\frac{7}{6}$

Correct answer:

$\frac{8}{3}$

Explanation:

To rearrange the equation into a $y=mx+b$ format, you want to isolate the $y$ so that it is the sole variable, without a coefficient, on one side of the equation.

First, add $11x$ to both sides to get $6y=7+16x$ .

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

If you divide each part of the numerator by 6, you get $y=\frac{7}{6}+\frac{16x}{6}$ . This is in a $y=b+mx$ form, and the $m$ is equal to $\frac{16}{6}$ , which is reduced down to $\frac{8}{3}$ for the correct answer.

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Example Question #222 : Geometry

What is the slope of the given linear equation?

2x + 4y = -7

Possible Answers:

-2

1/2

-1/2

-7/2

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)

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

What is the slope of the line:

$\frac{14}{3}x=\frac{1}{6}y-7$

Possible Answers:

$\frac{1}{28}$

$-\frac{1}{28}$

Correct answer:

Explanation:

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

–(1/6)y = –(14/3)x – 7 =>

y = 6(14/3)x – 7

y = 28x – 7.

The slope is 28.

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

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

Possible Answers:

$-\frac{1}{2}$

$\frac{1}{2}$

$4$

$-\frac{2}{3}$

$\frac{2}{3}$

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.

$m=\frac{y_2-y_1}{x_2-x_1}$

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

$m=\frac{1-2}{3-5}=\frac{-1}{-2}=\frac{1}{2}$

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Example Question #41 : Coordinate Geometry

What is the slope of a line running through points (7,3) and (8,-4) ?

Possible Answers:

$\frac{7}{3}$

$-\frac{1}{7}$

Correct answer:

Explanation:

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

$m=\frac{y_2-y_1}{x_2-x_1}$

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

$m=\frac{3-(-4)}{7-8}=\frac{7}{-1}=-7$

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Example Question #10 : How To Find The Slope Of A Line

What is the slope of the line defined as 3x + 4y = 22 ?

Possible Answers:

$\frac{4}{3}$

$\frac{-3}{4}$

$\frac{-4}{3}$

$\frac{-2}{11}$

$\frac{11}{2}$

Correct answer:

$\frac{-3}{4}$

Explanation:

3x + 4y = 22

To calculate the slope of a line from an equation of the line, the easiest way to proceed is to solve it for . This will put it into the format y=mx+b , making it very easy to find the slope . For our equation, it is:

4y = 22-3x or 4y = -3x+22

Next you merely need to divide by :

$y = \frac{-3}{4}x+\frac{22}{4}$

Thus, the slope is $\frac{-3}{4}$

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Example Question #96 : Algebra

What is the slope of the line perpendicular to 4x + 2y = 88 ?

Possible Answers:

$\frac{-1}{11}$

$\frac{44}{3}$

$\frac{1}{2}$

Correct answer:

$\frac{1}{2}$

Explanation:

To begin, it is easiest to find the slope of a line by putting it into the form y=mx+b . is the slope, so you can immediately find this once you have the format correct. Thus, solve our equation for :

2y = 88-4x

y = -2x +44

Now, recall that perpendicular lines have slopes of opposite sign and reciprocal numerical value. Thus, if our slope is , its perpendicular paired line will have a slope of $\frac{1}{2}$ .

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Example Question #96 : Algebra

What is the slope of the line defined by the equation 3x + 5y = y + 20 ?

Possible Answers:

$\frac{4}{3}$

$\frac{1}{3}$

$-\frac{3}{4}$

Correct answer:

$-\frac{3}{4}$

Explanation:

The easiest way to find the slope of a line based on its equation is to put it into the form y=mx+b . In this form, you know that is the slope.

Start with your original equation 3x + 5y = y + 20 .

Now, subtract from both sides:

3x + 4y = 20

Next, subtract from both sides:

4y = 20-3x

Finally, divide by :

$y = 5-\frac{3}{4}x$

This is the same as:

$y = -\frac{3}{4}x + 5$

Thus, the slope is $-\frac{3}{4}$ .

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Example Question #97 : Algebra

What is the slope of the line represented by the equation 4y - 5 = 12x ?

Possible Answers:

1/3

-5/12

Correct answer:

Explanation:

The slope of an equation can be calculated by simplifying the equation to the slope-intercept form y = mx + b , where m=slope.

Since 4y - 5 = 12x , we can solve for y. In shifting the 5 to the other side, we are left with 4y = 12x + 5 .

This can be further simplified to

$y = 3x + \frac{5}{4}$ , leaving us with the y = mx + b slope intercept form.

In this scenario, m=3 , so slope .

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Example Question #31 : Lines

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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ACT Math : Lines

Study concepts, example questions & explanations for ACT Math

All ACT Math Resources

Example Questions

Example Question #41 : Coordinate Geometry

Example Question #222 : Geometry

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

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

Example Question #41 : Coordinate Geometry

Example Question #10 : How To Find The Slope Of A Line

Example Question #96 : Algebra

Example Question #96 : Algebra

Example Question #97 : Algebra

Example Question #31 : Lines

All ACT Math Resources

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