Math Problem Statement

Write an equation in slope-intercept form of the line that passes through the point (-5, -7) and is parallel to the graph of the equation y = -2x + 4.

Solution

The problem asks for the equation of a line in slope-intercept form, y=mx+by = mx + b, which passes through the point (5,7)(-5, -7) and is parallel to the line given by the equation y=2x+4y = -2x + 4.

Steps to solve:

  1. Find the slope (m): The slope of the given line y=2x+4y = -2x + 4 is m=2m = -2. Since the new line is parallel, it will have the same slope, m=2m = -2.

  2. Use the point-slope form of a line: The point-slope form is: yy1=m(xx1)y - y_1 = m(x - x_1) where (x1,y1)(x_1, y_1) is the point the line passes through. Here, (x1,y1)=(5,7)(x_1, y_1) = (-5, -7) and m=2m = -2.

    Substituting these values into the equation: y(7)=2(x(5))y - (-7) = -2(x - (-5)) This simplifies to: y+7=2(x+5)y + 7 = -2(x + 5)

  3. Simplify to slope-intercept form: Now distribute the slope on the right-hand side: y+7=2x10y + 7 = -2x - 10 Subtract 7 from both sides to isolate yy: y=2x17y = -2x - 17

Final Answer:

The equation of the line in slope-intercept form is: y=2x17y = -2x - 17

Would you like more details or have any further questions?

Here are some related questions:

  1. How do you find the slope when lines are perpendicular?
  2. What changes when the problem asks for a perpendicular line instead of a parallel one?
  3. Can you solve for the equation of a line given two points?
  4. What is the difference between point-slope and slope-intercept form?
  5. How do you convert a line equation from standard form to slope-intercept form?

Tip: Parallel lines always have the same slope!

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Math Problem Analysis

Mathematical Concepts

Linear Equations
Slope-Intercept Form
Parallel Lines

Formulas

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

Theorems

The slopes of parallel lines are equal

Suitable Grade Level

Grades 8-10