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The given line passes through the points (0, -3) and (2, 3).

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

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 :

Let's find the equation of the line that is parallel to the given line and passes through the point [tex]\((-1, -1)\)[/tex].

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 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 using the formula:
[tex]\[ m = \frac{y_2 - y_1}{x_2 - x_1} \][/tex]
Substituting the coordinates [tex]\((0, -3)\)[/tex] and [tex]\((2, 3)\)[/tex]:
[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. Find the Slope of the Parallel Line:
Since the lines are parallel, they have the same slope. Thus, the slope of the new line is also 3.

3. Use the Point-Slope Form Equation:
The point-slope form of the equation of a line is given by:
[tex]\[ y - y_1 = m(x - x_1) \][/tex]
Here, [tex]\(m\)[/tex] is the slope (which is 3), and [tex]\((x_1, y_1)\)[/tex] is the point through which the line passes (which is [tex]\((-1, -1)\)[/tex]).

4. Substitute the Slope and Point into the Point-Slope Form:
Substituting [tex]\(m = 3\)[/tex], [tex]\(x_1 = -1\)[/tex], and [tex]\(y_1 = -1\)[/tex] into the point-slope form:
[tex]\[ y - (-1) = 3(x - (-1)) \][/tex]
Simplifying this equation:
[tex]\[ y + 1 = 3(x + 1) \][/tex]

Thus, the 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 answer is:
[tex]\[ \boxed{y+1=3(x+1)} \][/tex]
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