Math Problem Statement

What is an equation of the line that passes through the points left parenthesis, minus, 1, comma, 6, right parenthesis(−1,6) and left parenthesis, 4, comma, minus, 4, right parenthesis(4,−4)?

Solution

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

y=mx+by = mx + b

where mm is the slope, and bb is the y-intercept.

Step 1: Find the slope mm

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}

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

m=464(1)=464+1=105=2m = \frac{-4 - 6}{4 - (-1)} = \frac{-4 - 6}{4 + 1} = \frac{-10}{5} = -2

So, the slope of the line is 2-2.

Step 2: Use the slope-intercept form

Now that we have the slope m=2m = -2, we can substitute it into the slope-intercept form y=mx+by = mx + b. To find bb, the y-intercept, we substitute one of the given points into the equation. Let's use the point (1,6)(-1, 6):

6=2(1)+b6 = -2(-1) + b

Simplifying:

6=2+b6 = 2 + b

Solving for bb:

b=62=4b = 6 - 2 = 4

Step 3: Write the equation

Now that we have m=2m = -2 and b=4b = 4, the equation of the line is:

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

This is the equation of the line that passes through the points (1,6)(-1, 6) and (4,4)(4, -4).

Would you like further details or have any questions? Here are 5 related questions:

  1. How do you derive the slope formula from two points?
  2. What is the point-slope form of a line equation?
  3. Can you find the midpoint of the segment between (1,6)(-1, 6) and (4,4)(4, -4)?
  4. How do parallel lines relate in terms of slope?
  5. What is the significance of the y-intercept in real-world problems?

Tip: Always verify your slope calculation as a first step, because it affects the entire equation.

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Math Problem Analysis

Mathematical Concepts

Algebra
Linear Equations
Slope-Intercept Form

Formulas

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

Theorems

Slope formula
Slope-Intercept Form

Suitable Grade Level

Grades 8-10