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Activity

In this activity, you'll analyze a linear equation that represents a real-world situation to determine its slope and intercepts. Then you'll graph the linear equation on the coordinate plane and identify its point-slope form.

Scenario:

The 240 ninth-graders at a high school are divided into homeroom groups of 10 or 12 students. This equation models the situation, where [tex]$x$[/tex] represents the number of 10-student groups and [tex]$y$[/tex] represents the number of 12-student groups:

[tex]\[10x + 12y = 240.\][/tex]

Part A

Type the correct answer in each box. Use numerals instead of words. If necessary, use / for the fraction bar.

1. The [tex]$x$[/tex]-intercept is located at ([tex]\square[/tex], 0).
2. The [tex]$y$[/tex]-intercept is located at (0, [tex]\square[/tex]).
3. The slope of the line represented by this equation is [tex]\square[/tex].

Submit


Sagot :

To solve the given problem, we need to find the x-intercept, y-intercept, and slope of the linear equation [tex]\(10x + 12y = 240\)[/tex].

Step-by-Step Detailed Solution:

1. Finding the x-intercept:
To find the x-intercept, we set [tex]\(y = 0\)[/tex] in the equation and solve for [tex]\(x\)[/tex].
[tex]\[ 10x + 12(0) = 240 \][/tex]
Simplifying this equation:
[tex]\[ 10x = 240 \][/tex]
Divide both sides by 10:
[tex]\[ x = 24 \][/tex]
Therefore, the x-intercept is at [tex]\((24, 0)\)[/tex].

2. Finding the y-intercept:
To find the y-intercept, we set [tex]\(x = 0\)[/tex] in the equation and solve for [tex]\(y\)[/tex].
[tex]\[ 10(0) + 12y = 240 \][/tex]
Simplifying this equation:
[tex]\[ 12y = 240 \][/tex]
Divide both sides by 12:
[tex]\[ y = 20 \][/tex]
Therefore, the y-intercept is at [tex]\((0, 20)\)[/tex].

3. Finding the slope:
We rearrange the given equation into the slope-intercept form [tex]\(y = mx + b\)[/tex], where [tex]\(m\)[/tex] is the slope.
The given equation is:
[tex]\[ 10x + 12y = 240 \][/tex]
Solve for [tex]\(y\)[/tex]:
[tex]\[ 12y = -10x + 240 \][/tex]
Divide every term by 12:
[tex]\[ y = -\frac{10}{12}x + \frac{240}{12} \][/tex]
Simplify the fractions:
[tex]\[ y = -\frac{5}{6}x + 20 \][/tex]
Therefore, the slope of the line is [tex]\(-\frac{5}{6}\)[/tex].

So, the final answers are:

- The x-intercept is located at [tex]\((24, 0)\)[/tex].
- The y-intercept is located at [tex]\((0, 20)\)[/tex].
- The slope of the line represented by this equation is [tex]\(-\frac{5}{6}\)[/tex].