Math Problem Statement

Find the equation of a line perpendicular toy, equals, 2, x, minus, 6y=2x−6that passes through the point left parenthesis, minus, 8, comma, minus, 2, right parenthesis(−8,−2).

Solution

We are tasked with finding the equation of a line that is perpendicular to the line y=2x6y = 2x - 6 and passes through the point (8,2)(-8, -2).

Step 1: Find the slope of the given line

The equation of the given line is in the slope-intercept form y=mx+by = mx + b, where mm is the slope. For the given equation:

y=2x6y = 2x - 6

Here, the slope m=2m = 2.

Step 2: Find the slope of the perpendicular line

Lines that are perpendicular have slopes that are negative reciprocals of each other. If the slope of the given line is 22, the slope of the perpendicular line will be:

mperpendicular=12m_{\text{perpendicular}} = -\frac{1}{2}

Step 3: Use the point-slope form of a line

The point-slope form of a line is:

yy1=m(xx1)y - y_1 = m(x - x_1)

where (x1,y1)(x_1, y_1) is a point on the line and mm is the slope. We know the slope of the perpendicular line is 12-\frac{1}{2}, and it passes through the point (8,2)(-8, -2).

Substitute m=12m = -\frac{1}{2}, x1=8x_1 = -8, and y1=2y_1 = -2 into the equation:

y(2)=12(x(8))y - (-2) = -\frac{1}{2}(x - (-8))

Simplify:

y+2=12(x+8)y + 2 = -\frac{1}{2}(x + 8)

Step 4: Simplify the equation

Distribute the slope on the right-hand side:

y+2=12x4y + 2 = -\frac{1}{2}x - 4

Subtract 2 from both sides to isolate yy:

y=12x42y = -\frac{1}{2}x - 4 - 2

y=12x6y = -\frac{1}{2}x - 6

Final Answer:

The equation of the line perpendicular to y=2x6y = 2x - 6 that passes through the point (8,2)(-8, -2) is:

y=12x6y = -\frac{1}{2}x - 6

Would you like more details or have any questions?

Here are 5 related questions you can explore:

  1. How do you find the equation of a line parallel to a given line?
  2. What is the general form of the equation of a line?
  3. How do you convert the slope-intercept form to standard form?
  4. How do you calculate the distance between a point and a line?
  5. What is the relationship between slopes of perpendicular lines?

Tip: When dealing with perpendicular lines, always remember their slopes are negative reciprocals of each other.

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Math Problem Analysis

Mathematical Concepts

Algebra
Linear Equations
Perpendicular Lines

Formulas

Slope-intercept form: y = mx + b
Point-slope form: y - y1 = m(x - x1)
Negative reciprocal for perpendicular slopes: m1 * m2 = -1

Theorems

Properties of perpendicular lines in coordinate geometry

Suitable Grade Level

Grades 8-10