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High School Math : How to graph a line in pre-algebra

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Example Questions

Example Question #651 : Pre Algebra

What is the slope of the line that contains the points

(8,12) and (9,-7)?

Possible Answers:

m=-19

m=-13

$m=\frac{1}{2}$

m=-13

m=8

Correct answer:

m=-19

Explanation:

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

$m=\frac{Y-y}{X-x}$

We must then properly assign the points to the equation as (X,Y) and (x,y) .

In this case we will make (9,-7) our and (8,12) our .

Plugging the points into the equation yields

$m=\frac{-7-12}{9-8}$

Perform the math to arrive at

$m=\frac{-19}{1}$

The answer is m=-19 .

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Example Question #2 : How To Graph A Line In Pre Algebra

What is the slope of the line y=15x+13 ?

Possible Answers:

Correct answer:

Explanation:

In the standard form of a line y=mx+b the slope is represented by the variable .

In this case the line y=15x+13 has a slope of .

The answer is .

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Example Question #1 : Graphing Lines

The equation of a line is y=4x-7 .

What are the slope and the y-intercept?

Possible Answers:

Slope:

y-intercept: (0,-7)

Slope: $\frac{1}{4}$

y-intercept: (0,-7)

Slope: $\frac{1}{4}$

y-intercept: (0,7)

Slope:

y-intercept: (0,7)

Correct answer:

Slope:

y-intercept: (0,-7)

Explanation:

The equation of the line is written in slope-intercept form, y=mx+b , where is the slope and is the y-intercept. In this example, the y-intercept is a negative number.

y=4x-7

m=4

b=-7

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Example Question #51 : Graphing

What is the slope of the line that contains the points (61,3) and (13,22) ?

Possible Answers:

m=15

$m=\frac{13}{22}$

$m=-\frac{19}{48}$

m=-5

Correct answer:

$m=-\frac{19}{48}$

Explanation:

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 (61,3) for and (13,22) for .

Plugging the points into the equation yields $m=\frac{3-13}{61-22}$ .

Perform the math to arrive at $m=\frac{-19}{48}$ .

The answer is $m=-\frac{19}{48}$ .

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High School Math : How to graph a line in pre-algebra

Study concepts, example questions & explanations for High School Math

All High School Math Resources

Example Questions

Example Question #651 : Pre Algebra

Example Question #2 : How To Graph A Line In Pre Algebra

Example Question #1 : Graphing Lines

Example Question #51 : Graphing

All High School Math Resources

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