Math Problem Statement

Find the equation (in terms of x) of the line through the points (-4,6) and (1,-4).

y=

Solution

To find the equation of the line passing through the points (4,6)(-4, 6) and (1,4)(1, -4), we can use the point-slope form of the equation of a line:

yy1=m(xx1)y - y_1 = m(x - x_1)

where mm is the slope of the line, and (x1,y1)(x_1, y_1) is one of the points on the line.

Step 1: Find the Slope (mm)

The slope mm is calculated as:

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

Using the points (4,6)(-4, 6) and (1,4)(1, -4):

m=461(4)=105=2m = \frac{-4 - 6}{1 - (-4)} = \frac{-10}{5} = -2

Step 2: Use the Point-Slope Form

Now, substitute m=2m = -2 and one of the points, say (1,4)(1, -4), into the point-slope form:

y(4)=2(x1)y - (-4) = -2(x - 1)

Simplify the equation:

y+4=2(x1)y + 4 = -2(x - 1)

Step 3: Simplify to the Slope-Intercept Form (y=mx+by = mx + b)

Expand and simplify:

y+4=2x+2y + 4 = -2x + 2

Subtract 4 from both sides:

y=2x2y = -2x - 2

So, the equation of the line in terms of xx is:

y=2x2\boxed{y = -2x - 2}

Would you like more details or have any questions?

Here are some related questions to explore:

  1. How would you find the equation of a line given its slope and one point?
  2. What is the general form of the equation of a line?
  3. How do you determine if two lines are parallel or perpendicular?
  4. Can you find the y-intercept of a line given two points?
  5. How does changing the slope affect the steepness of a line?

Tip: When calculating the slope between two points, remember that a negative slope means the line is decreasing (going downwards) as it moves from left to right.

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Math Problem Analysis

Mathematical Concepts

Algebra
Linear Equations
Slope-Intercept Form

Formulas

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

Theorems

Slope formula
Point-slope theorem

Suitable Grade Level

Grades 8-10