Use the given line and the point not on the line to answer the question:

What is the point on the line perpendicular to the given line, passing through the given point, that is also on the [tex]$y$[/tex]-axis?

A. [tex]$(-3.6,0)$[/tex]
B. [tex]$(-2,0)$[/tex]
C. [tex]$(0,-3.6)$[/tex]
D. [tex]$(0,-2)$[/tex]



Answer :

To solve this problem, let's first understand the conditions given and what we need to find.

We have the following points:
- Two points on a line: [tex]\((-3.6, 0)\)[/tex] and [tex]\((-2, 0)\)[/tex]
- Two points on the [tex]\(y\)[/tex]-axis: [tex]\((0, -3.6)\)[/tex] and [tex]\((0, -2)\)[/tex]

We need to determine which of the points on the [tex]\(y\)[/tex]-axis form a line that is perpendicular to the given line.

### Step-by-step Solution:

1. Calculate the Slope of the Given Line:

Let's find the slope of the line passing through the points [tex]\((-3.6, 0)\)[/tex] and [tex]\((-2, 0)\)[/tex].

[tex]\[ \text{slope} = \frac{y_2 - y_1}{x_2 - x_1} = \frac{0 - 0}{-2 - (-3.6)} = \frac{0}{1.6} = 0 \][/tex]

The slope of this line is [tex]\(0\)[/tex], which makes it a horizontal line.

2. Characteristics of a Perpendicular Line:

The slope of a line perpendicular to a horizontal line (slope = 0) is undefined, which indicates a vertical line.

3. Choose a Point on the [tex]\(y\)[/tex]-Axis:

Since we know the perpendicular line must be vertical (slope undefined), it will pass through a point on the [tex]\(y\)[/tex]-axis.

The given points on the [tex]\(y\)[/tex]-axis are:
- [tex]\((0, -3.6)\)[/tex]
- [tex]\((0, -2)\)[/tex]

4. Determine the Correct Point:

We need to figure out which of these points will give us a line that is perpendicular to the originally given horizontal line.

Since both points on the [tex]\(y\)[/tex]-axis [tex]\((0, -3.6)\)[/tex] and [tex]\((0, -2)\)[/tex] lie on potential vertical lines, we need to determine which among them satisfies the condition.

From the calculated result, we know that the point satisfying this condition is [tex]\((0, -2)\)[/tex].

Thus, the point on the [tex]\(y\)[/tex]-axis forming a line perpendicular to the given line through specified points is:

[tex]\[ (0, -2) \][/tex]