Math Problem Statement

Write an equation of a line containing the given point and parallel to the given line: (3, -1); 8x - 3y = 5.

Solution

The problem asks to find the equation of a line that is parallel to the given line and passes through the point (3,1)(3, -1).

Step 1: Find the slope of the given line

The given line is in standard form:
8x3y=58x - 3y = 5

We need to rewrite this in slope-intercept form y=mx+by = mx + b to find the slope.

First, solve for yy: 3y=8x+5-3y = -8x + 5 y=83x53y = \frac{8}{3}x - \frac{5}{3} The slope mm of this line is 83\frac{8}{3}.

Step 2: Write the equation of the parallel line

Parallel lines have the same slope, so the slope of the new line is also 83\frac{8}{3}.

We use the point-slope form to find the equation of the line passing through (3,1)(3, -1): yy1=m(xx1)y - y_1 = m(x - x_1) where m=83m = \frac{8}{3}, (x1,y1)=(3,1)(x_1, y_1) = (3, -1). Substituting the values: y(1)=83(x3)y - (-1) = \frac{8}{3}(x - 3) y+1=83(x3)y + 1 = \frac{8}{3}(x - 3)

Step 3: Simplify the equation

Distribute the slope on the right side: y+1=83x8y + 1 = \frac{8}{3}x - 8 Subtract 1 from both sides: y=83x9y = \frac{8}{3}x - 9

Thus, the equation of the line parallel to 8x3y=58x - 3y = 5 and passing through (3,1)(3, -1) is: y=83x9y = \frac{8}{3}x - 9

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Here are 5 related questions for practice:

  1. What is the equation of a line parallel to 2xy=42x - y = 4 and passing through (5,2)(5, 2)?
  2. How would the equation change if the new line was perpendicular to the original line?
  3. Find the slope of a line perpendicular to the line 4x+5y=104x + 5y = 10.
  4. How do you convert an equation from standard form to slope-intercept form?
  5. What is the equation of a line passing through (2,3)(-2, 3) and parallel to y=12x+6y = -\frac{1}{2}x + 6?

Tip:

For parallel lines, always remember that they share the same slope. For perpendicular lines, their slopes are negative reciprocals of each other.

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Math Problem Analysis

Mathematical Concepts

Algebra
Linear Equations
Parallel Lines
Point-Slope Form

Formulas

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

Theorems

Parallel lines have the same slope

Suitable Grade Level

Grades 7-9