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What is the equation of the line that passes through the point [tex]\((-2, -8)\)[/tex] and has a slope of 3?

A. [tex]\( y = 3x - 2 \)[/tex]
B. [tex]\( y = 3x - 27 \)[/tex]
C. [tex]\( y = 3x + 2 \)[/tex]
D. [tex]\( y = 3x + 22 \)[/tex]

Sagot :

Sure, let's solve the problem step-by-step to find the equation of the line that passes through the point [tex]\((-2, -8)\)[/tex] and has a slope of 3.

1. Understand the point-slope form of a line:
The point-slope form of a line is given by:
[tex]\[ y - y_1 = m(x - x_1) \][/tex]
where [tex]\((x_1, y_1)\)[/tex] is a point on the line and [tex]\(m\)[/tex] is the slope of the line.

2. Identify the given values:
Here, the given point is [tex]\((-2, -8)\)[/tex] and the slope [tex]\(m\)[/tex] is 3.

3. Substitute the given values into the point-slope form:
Substitute [tex]\(x_1 = -2\)[/tex], [tex]\(y_1 = -8\)[/tex], and [tex]\(m = 3\)[/tex] into the equation:
[tex]\[ y - (-8) = 3(x - (-2)) \][/tex]

4. Simplify the equation:
[tex]\[ y + 8 = 3(x + 2) \][/tex]
Distribute 3 on the right-hand side:
[tex]\[ y + 8 = 3x + 6 \][/tex]
Isolate [tex]\(y\)[/tex] by subtracting 8 from both sides:
[tex]\[ y = 3x + 6 - 8 \][/tex]
Simplify the right-hand side:
[tex]\[ y = 3x - 2 \][/tex]

So, the equation of the line is:
[tex]\[ y = 3x - 2 \][/tex]

Given the multiple-choice options, the correct answer is:
[tex]\[ y = 3x - 2 \][/tex]