Math Problem Statement

Find the equation (in terms of x) of the line through the points (-1, -6) and (1, -2)

Solution

To find the equation of the line passing through the points (1,6)(-1, -6) and (1,2)(1, -2), we will follow these steps:

Step 1: Calculate the slope (m)

The slope mm of a line passing through two points (x1,y1)(x_1, y_1) and (x2,y2)(x_2, y_2) is given by the formula: m=y2y1x2x1m = \frac{y_2 - y_1}{x_2 - x_1} Substituting the given points (1,6)(-1, -6) and (1,2)(1, -2): m=2(6)1(1)=2+61+1=42=2m = \frac{-2 - (-6)}{1 - (-1)} = \frac{-2 + 6}{1 + 1} = \frac{4}{2} = 2 Thus, the slope m=2m = 2.

Step 2: Use the point-slope form

The equation of a line with slope mm passing through a point (x1,y1)(x_1, y_1) is given by the point-slope form: yy1=m(xx1)y - y_1 = m(x - x_1) Using the point (1,6)(-1, -6) and the slope m=2m = 2: y(6)=2(x(1))y - (-6) = 2(x - (-1)) This simplifies to: y+6=2(x+1)y + 6 = 2(x + 1)

Step 3: Simplify to slope-intercept form

Now, expand and simplify the equation: y+6=2(x+1)y + 6 = 2(x + 1) y+6=2x+2y + 6 = 2x + 2 y=2x+26y = 2x + 2 - 6 y=2x4y = 2x - 4

Thus, the equation of the line is: y=2x4y = 2x - 4

Would you like further details or have any questions?

Here are 5 related questions to consider:

  1. What would the equation of the line be if it passed through the points (0,0)(0, 0) and (1,2)(1, 2)?
  2. How do we find the y-intercept directly from the point-slope form?
  3. How can you verify if another point lies on this line?
  4. How do you convert from point-slope form to standard form?
  5. What is the significance of the slope in the context of the line's steepness?

Tip: Always check your final equation by substituting the points back into it to ensure both satisfy the equation.

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Math Problem Analysis

Mathematical Concepts

Algebra
Linear Equations

Formulas

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

Theorems

Slope-Intercept Theorem
Point-Slope Theorem

Suitable Grade Level

Grades 8-10