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The given line passes through the points [tex][tex]$(-4,-3)$[/tex][/tex] and [tex][tex]$(4,1)$[/tex][/tex].

What is the equation, in point-slope form, of the line that is perpendicular to the given line and passes through the point [tex][tex]$(-4,3)$[/tex][/tex]?

A. [tex][tex]$y-3=-2(x+4)$[/tex][/tex]
B. [tex][tex]$y-3=-\frac{1}{2}(x+4)$[/tex][/tex]
C. [tex][tex]$y-3=\frac{1}{2}(x+4)$[/tex][/tex]
D. [tex][tex]$y-3=2(x+4)$[/tex][/tex]


Sagot :

To solve this problem, we'll start by finding the slope of the given line that passes through the points [tex]\((-4, -3)\)[/tex] and [tex]\((4, 1)\)[/tex]. The slope [tex]\(m\)[/tex] of a line passing through two points [tex]\((x_1, y_1)\)[/tex] and [tex]\((x_2, y_2)\)[/tex] is calculated as:

[tex]\[ m = \frac{y_2 - y_1}{x_2 - x_1} \][/tex]

Substituting the given points:

[tex]\[ m = \frac{1 - (-3)}{4 - (-4)} = \frac{1 + 3}{4 + 4} = \frac{4}{8} = \frac{1}{2} \][/tex]

So, the slope [tex]\(m\)[/tex] of the given line is [tex]\(\frac{1}{2}\)[/tex].

Next, we need to find the slope of the line that is perpendicular to this given line. The slope of a line that is perpendicular to another line is the negative reciprocal of the slope of the original line. The negative reciprocal of [tex]\(\frac{1}{2}\)[/tex] is:

[tex]\[ m_{\text{perpendicular}} = -\frac{1}{\frac{1}{2}} = -2 \][/tex]

Thus, the slope of the line perpendicular to the original line is [tex]\(-2\)[/tex].

We are also given that this perpendicular line passes through the point [tex]\((-4, 3)\)[/tex]. To find the equation of this perpendicular line in point-slope form, we use the point-slope formula:

[tex]\[ y - y_1 = m_{\text{perpendicular}} (x - x_1) \][/tex]

Here, [tex]\((x_1, y_1) = (-4, 3)\)[/tex] and [tex]\(m_{\text{perpendicular}} = -2\)[/tex]. Substituting these values into the point-slope formula:

[tex]\[ y - 3 = -2 (x + 4) \][/tex]

This matches with one of the provided options. Therefore, the equation of the line that is perpendicular to the given line and passes through the point [tex]\((-4, 3)\)[/tex] is:

[tex]\[ y - 3 = -2 (x + 4) \][/tex]

So, the correct answer is [tex]\(y - 3 = -2 (x + 4)\)[/tex].