Math Problem Statement

What is an equation of the line that passes through (−4,−3) and (8,6)

Solution

To find the equation of the line passing through the points (-4, -3) and (8, 6), we follow these steps:

1. Find the slope of the line using the formula:

m=y2y1x2x1m = \frac{y_2 - y_1}{x_2 - x_1} Where:

  • (x1,y1)=(4,3)(x_1, y_1) = (-4, -3)
  • (x2,y2)=(8,6)(x_2, y_2) = (8, 6)

Substitute the values: m=6(3)8(4)=6+38+4=912=34m = \frac{6 - (-3)}{8 - (-4)} = \frac{6 + 3}{8 + 4} = \frac{9}{12} = \frac{3}{4}

So, the slope m=34m = \frac{3}{4}.

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

yy1=m(xx1)y - y_1 = m(x - x_1) Using the point (-4, -3) and the slope 34\frac{3}{4}: y(3)=34(x(4))y - (-3) = \frac{3}{4}(x - (-4)) Simplify: y+3=34(x+4)y + 3 = \frac{3}{4}(x + 4)

3. Distribute and solve for yy:

y+3=34x+34×4y + 3 = \frac{3}{4}x + \frac{3}{4} \times 4 y+3=34x+3y + 3 = \frac{3}{4}x + 3 Subtract 3 from both sides: y=34xy = \frac{3}{4}x

Final equation:

y=34xy = \frac{3}{4}x

This is the equation of the line passing through the points (-4, -3) and (8, 6).

Would you like further details on any part of this solution?

Here are 5 related questions you can explore:

  1. How would the equation change if the points were (0, 0) and (8, 6)?
  2. What is the significance of the slope in this context?
  3. How do you find the slope-intercept form from point-slope form?
  4. Can a line have a slope of zero? What would its equation look like?
  5. How can you find the distance between the two points used here?

Tip: The slope tells you how steep a line is; it's the ratio of the vertical change to the horizontal change.

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Math Problem Analysis

Mathematical Concepts

Algebra
Linear Equations
Slope-Intercept Form
Point-Slope Form

Formulas

Slope formula: m = (y2 - y1) / (x2 - x1)
Point-slope form: y - y1 = m(x - x1)

Theorems

Slope formula for a line
Equation of a line in point-slope form

Suitable Grade Level

Grades 8-10