Math Problem Statement

Write the equation of the line through (-2,1) that is parallel to 4x−5y=6

Solution

To find the equation of the line through (2,1)(-2,1) that is parallel to 4x5y=64x - 5y = 6, follow these steps:

Step 1: Rewrite the given equation in slope-intercept form (y=mx+by = mx + b):

Start with: 4x5y=64x - 5y = 6

Solve for yy: 5y=4x+6-5y = -4x + 6 y=45x65y = \frac{4}{5}x - \frac{6}{5}

The slope (mm) of the line is 45\frac{4}{5}.

Step 2: Use the point-slope form of the equation of a line:

The formula is: yy1=m(xx1)y - y_1 = m(x - x_1) Here, (x1,y1)=(2,1)(x_1, y_1) = (-2, 1) and m=45m = \frac{4}{5}.

Substitute these values: y1=45(x(2))y - 1 = \frac{4}{5}(x - (-2)) y1=45(x+2)y - 1 = \frac{4}{5}(x + 2)

Step 3: Simplify the equation:

Distribute 45\frac{4}{5}: y1=45x+85y - 1 = \frac{4}{5}x + \frac{8}{5}

Add 1 (55\frac{5}{5}) to both sides: y=45x+85+55y = \frac{4}{5}x + \frac{8}{5} + \frac{5}{5} y=45x+135y = \frac{4}{5}x + \frac{13}{5}

Final Answer:

The equation of the line is: y=45x+135y = \frac{4}{5}x + \frac{13}{5}


Do you want further details or have any questions? Here are 5 related questions to explore:

  1. How do you find the equation of a line perpendicular to 4x5y=64x - 5y = 6 through the same point?
  2. What is the slope-intercept form of a line?
  3. Can you find the x- and y-intercepts of the new line y=45x+135y = \frac{4}{5}x + \frac{13}{5}?
  4. How would you write the equation of the parallel line in standard form?
  5. What are the properties of parallel lines in terms of slopes?

Tip: Always remember that parallel lines have the same slope!

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Math Problem Analysis

Mathematical Concepts

Algebra
Linear Equations
Parallel Lines

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 8-10