Math Problem Statement

Find an equation of the line that satisfies the given conditions.

Through (−2, 8);  slope −1

Solution

To find the equation of a line given a point (2,8)(-2, 8) and a slope of 1-1, we can use the point-slope form of the equation of a line:

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

where mm is the slope, and (x1,y1)(x_1, y_1) is the given point.

Given:

  • m=1m = -1
  • (x1,y1)=(2,8)(x_1, y_1) = (-2, 8)

Substitute these values into the point-slope form:

y8=1(x+2)y - 8 = -1(x + 2)

Now simplify the equation:

y8=x2y - 8 = -x - 2

Add 8 to both sides:

y=x+6y = -x + 6

Thus, the equation of the line is:

y=x+6y = -x + 6

Would you like more details or have any questions about this solution?

Here are 5 related questions for further practice:

  1. Find the equation of a line passing through (3,5)(3, -5) with slope 22.
  2. Determine the slope of the line passing through the points (1,2)(1, 2) and (4,1)(4, -1).
  3. Convert the equation y=2x7y = 2x - 7 to standard form.
  4. Find the x-intercept and y-intercept of the line y=3x+9y = -3x + 9.
  5. Determine if the lines y=12x+4y = \frac{1}{2}x + 4 and y=12x3y = \frac{1}{2}x - 3 are parallel.

Tip: The slope tells you how steep a line is. A negative slope means the line decreases as you move to the right.

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Math Problem Analysis

Mathematical Concepts

Algebra
Linear Equations
Slope-Intercept Form
Point-Slope Form

Formulas

Point-Slope form: y - y₁ = m(x - x₁)
Slope-Intercept form: y = mx + b

Theorems

Slope of a Line
Point-Slope Theorem

Suitable Grade Level

Grades 8-10