A given line has the equation [tex]2x + 12y = -1[/tex].

What is the equation, in slope-intercept form, of the line that is perpendicular to the given line and passes through the point [tex](0, 9)[/tex]?

A. [tex]y = -6x + 9[/tex]
B. [tex]y = -\frac{1}{6}x + 9[/tex]
C. [tex]y = \frac{1}{6}x + 9[/tex]
D. [tex]y = 6x + 9[/tex]



Answer :

To find the equation of the line that is perpendicular to a given line and passes through a specific point, follow these steps:

1. Identify the Slope of the Given Line:
The given line equation is [tex]\(2x + 12y = -1\)[/tex]. We need to convert this into the slope-intercept form [tex]\(y = mx + b\)[/tex], where [tex]\(m\)[/tex] is the slope.
[tex]\[ 2x + 12y = -1 \][/tex]
Solve for [tex]\(y\)[/tex]:
[tex]\[ 12y = -2x - 1 \\ y = \left(-\frac{2}{12}\right)x - \frac{1}{12} \\ y = \left(-\frac{1}{6}\right)x - \frac{1}{12} \][/tex]
So, the slope [tex]\(m\)[/tex] of the given line is [tex]\(-\frac{1}{6}\)[/tex].

2. Determine the Slope of the Perpendicular Line:
The slope of a line that is perpendicular to another is the negative reciprocal of the original slope.
[tex]\[ \text{Given slope} = -\frac{1}{6} \\ \text{Perpendicular slope} = -\left(-\frac{1}{6}\right)^{-1} \\ = 6 \][/tex]

3. Use the Point-Slope Form:
We know the perpendicular line passes through the point [tex]\((0, 9)\)[/tex]. Using the point-slope form of a line equation, [tex]\(y - y_1 = m(x - x_1)\)[/tex], where [tex]\((x_1, y_1)\)[/tex] is the point it passes through and [tex]\(m\)[/tex] is the slope.
[tex]\[ y - 9 = 6(x - 0) \\ y - 9 = 6x \\ y = 6x + 9 \][/tex]

Thus, the equation of the line that is perpendicular to the given line and passes through the point [tex]\((0, 9)\)[/tex] is:

[tex]\[ y = 6x + 9 \][/tex]

So, the correct option is:
[tex]\[ \boxed{y = 6x + 9} \][/tex]