Math Problem Statement

The points (2, -4), (x, y), A, and B all lie on the line. Find an equation relating x and y.

Solution

To find the equation relating xx and yy for the points on this line, we can use the given points on the line to determine the slope and then form the linear equation.

Step-by-Step Solution

  1. Identify Points on the Line: We have two specific points on the line:

    • (2,4)(2, -4)
    • (10,3)(10, 3) (point CC)
  2. Calculate the Slope: The slope mm between two points (x1,y1)(x_1, y_1) and (x2,y2)(x_2, y_2) is given by: m=y2y1x2x1m = \frac{y_2 - y_1}{x_2 - x_1} Using the points (2,4)(2, -4) and (10,3)(10, 3): m=3(4)102=3+48=78m = \frac{3 - (-4)}{10 - 2} = \frac{3 + 4}{8} = \frac{7}{8}

  3. Form the Equation: We can use the point-slope form of a line: yy1=m(xx1)y - y_1 = m(x - x_1) Using the point (2,4)(2, -4) and the slope 78\frac{7}{8}: y(4)=78(x2)y - (-4) = \frac{7}{8}(x - 2) Simplify this to get: y+4=78x74y + 4 = \frac{7}{8}x - \frac{7}{4} Subtract 4 from both sides to isolate yy: y=78x744y = \frac{7}{8}x - \frac{7}{4} - 4 Converting 44 to a fraction with denominator 4: y=78x74164y = \frac{7}{8}x - \frac{7}{4} - \frac{16}{4} y=78x234y = \frac{7}{8}x - \frac{23}{4}

Final Equation

The equation of the line relating xx and yy is: y=78x234y = \frac{7}{8}x - \frac{23}{4}

Would you like a detailed explanation on any part of this solution or have further questions?

Related Questions

  1. How can you convert the slope-intercept form to the standard form of a line?
  2. What are some ways to check if a point lies on a line given its equation?
  3. How do you interpret the slope in real-world scenarios?
  4. What other forms of line equations exist besides slope-intercept and point-slope?
  5. Can you find an equation of a line perpendicular to this one?

Tip:

Always double-check your calculations, especially when converting between fraction forms, as small errors can lead to incorrect equations.

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Math Problem Analysis

Mathematical Concepts

Coordinate Geometry
Linear Equations
Slope Calculation

Formulas

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

Theorems

Concept of Slope
Equation of a Straight Line

Suitable Grade Level

Grades 8-10