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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 the line parallel to the one that passes through the given points [tex]\((0, -3)\)[/tex] and [tex]\((2, 3)\)[/tex] and also passes through the point [tex]\((-1, -1)\)[/tex], we can proceed step by step as follows:

Step 1: Calculate the Slope of the Given Line

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] can be calculated using the slope formula:

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

Substituting the coordinates of the given points [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]

Step 2: Use the Point-Slope Form of the Equation of a Line

The point-slope form of a line with slope [tex]\(m\)[/tex] passing through a point [tex]\((x_1, y_1)\)[/tex] is:

[tex]\[y - y_1 = m(x - x_1)\][/tex]

In this case, the slope is [tex]\(3\)[/tex] (since the lines are parallel, they have the same slope), and the line passes through the point [tex]\((-1, -1)\)[/tex].

So, we have:

[tex]\[y - (-1) = 3(x - (-1))\][/tex]

Step 3: Simplify the Equation

Simplify the left and right sides of the equation:

[tex]\[y + 1 = 3(x + 1)\][/tex]

Conclusion

The equation of the line in point-slope form, parallel to the given line and passing through the point [tex]\((-1, -1)\)[/tex], is:

[tex]\[y + 1 = 3(x + 1)\][/tex]

Thus, the correct answer is:

[tex]\[y + 1 = 3(x + 1)\][/tex]