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The given line passes through the points [tex]\((0, -3)\)[/tex] and [tex]\((2, 3)\)[/tex].

What is the equation, in point-slope form, of the line that is parallel to the given line and passes through the point [tex]\((-1, -1)\)[/tex]?

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


Sagot :

To find the equation of a line that is parallel to a given line and passes through a specific point, we need to find the slope of the given line first and then use this slope in the point-slope form of the equation. Let's go through this step-by-step:

1. Determine the Slope of the Given Line:
The given line passes through the points [tex]\((0, -3)\)[/tex] and [tex]\((2, 3)\)[/tex]. The formula for the slope [tex]\(m\)[/tex] between two points [tex]\((x_1, y_1)\)[/tex] and [tex]\((x_2, y_2)\)[/tex] is:
[tex]\[ m = \frac{y_2 - y_1}{x_2 - x_1} \][/tex]
Plugging in the coordinates:
[tex]\[ m = \frac{3 - (-3)}{2 - 0} = \frac{3 + 3}{2} = \frac{6}{2} = 3 \][/tex]
So, the slope of the given line is 3.

2. Use the Point-Slope Form of the Line Equation:
The point-slope form of the line equation is:
[tex]\[ y - y_1 = m(x - x_1) \][/tex]
We need to find the equation of the line that is parallel to the given line and passes through the point [tex]\((-1, -1)\)[/tex]. Since parallel lines have the same slope, we use the slope [tex]\(m = 3\)[/tex].

3. Plug in the Point and Slope:
We use the point [tex]\((-1, -1)\)[/tex] in the point-slope form:
[tex]\[ y - (-1) = 3(x - (-1)) \][/tex]
Simplifying this equation:
[tex]\[ y + 1 = 3(x + 1) \][/tex]

Hence, the correct equation of the line that is parallel to the given line and passes through the point [tex]\((-1, -1)\)[/tex] is:
[tex]\[ y + 1 = 3(x + 1) \][/tex]

Therefore, the correct option is:
[tex]\[ y + 1 = 3(x + 1) \][/tex]