What is the equation of the line that is perpendicular to the given line and has an [tex][tex]$x$[/tex][/tex]-intercept of 6?

Given line: [tex][tex]$y=-\frac{3}{4} x+8$[/tex][/tex]

Options:
A. [tex][tex]$y=-\frac{3}{4} x+6$[/tex][/tex]
B. [tex][tex]$y=\frac{4}{3} x-8$[/tex][/tex]
C. [tex][tex]$y=\frac{4}{3} x-6$[/tex][/tex]



Answer :

To find the equation of the line that is perpendicular to a given line and has a specified [tex]\( x \)[/tex]-intercept, follow these steps:

1. Identify the slope of the given line:
The given line is [tex]\( y = -\frac{3}{4}x + 6 \)[/tex].
The slope of this line is [tex]\( -\frac{3}{4} \)[/tex].

2. Find the slope of the perpendicular line:
Lines that are perpendicular to each other have slopes that are negative reciprocals.
Therefore, if the slope of the given line is [tex]\( -\frac{3}{4} \)[/tex], the slope [tex]\( m \)[/tex] of the perpendicular line will be:
[tex]\[ m = -\frac{1}{-\frac{3}{4}} = \frac{4}{3} \][/tex]

3. Determine the equation of the perpendicular line:
We need a line with the slope [tex]\( \frac{4}{3} \)[/tex] and an [tex]\( x \)[/tex]-intercept of 6.

The general form of the equation of a line is:
[tex]\[ y = mx + b \][/tex]
where [tex]\( m \)[/tex] is the slope and [tex]\( b \)[/tex] is the [tex]\( y \)[/tex]-intercept.

Since the [tex]\( x \)[/tex]-intercept is 6, at [tex]\( x = 6 \)[/tex], [tex]\( y = 0 \)[/tex]. Substituting these values into the equation:
[tex]\[ 0 = \frac{4}{3} \cdot 6 + b \][/tex]

4. Solve for the [tex]\( y \)[/tex]-intercept [tex]\( b \)[/tex]:
[tex]\[ 0 = \frac{4}{3} \cdot 6 + b \][/tex]
[tex]\[ 0 = 8 + b \][/tex]
[tex]\[ b = -8 \][/tex]

5. Write the final equation:
Substituting the slope [tex]\( \frac{4}{3} \)[/tex] and the [tex]\( y \)[/tex]-intercept [tex]\( -8 \)[/tex] back into the equation of the line, we get:
[tex]\[ y = \frac{4}{3}x - 8 \][/tex]

Therefore, the equation of the line that is perpendicular to the given line and has an [tex]\( x \)[/tex]-intercept of 6 is:
[tex]\[ y = \frac{4}{3}x - 8 \][/tex]

The correct answer is:
[tex]\[ y = \frac{4}{3}x - 8 \][/tex]

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