Math Problem Statement

what is the equation in point-slope form of the line that passes through the points (-4,2) and (12,6)?

Solution

To find the equation of the line in point-slope form that passes through the points (4,2)(-4, 2) and (12,6)(12, 6), follow these steps:

Step 1: Find the Slope

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:

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

Using (x1,y1)=(4,2)(x_1, y_1) = (-4, 2) and (x2,y2)=(12,6)(x_2, y_2) = (12, 6):

m=6212(4)=416=14m = \frac{6 - 2}{12 - (-4)} = \frac{4}{16} = \frac{1}{4}

So, the slope mm is 14\frac{1}{4}.

Step 2: Write the Equation in Point-Slope Form

The point-slope form of a line's equation is:

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

Using the point (4,2)(-4, 2) and the slope m=14m = \frac{1}{4}:

y2=14(x+4)y - 2 = \frac{1}{4}(x + 4)

Final Answer

The equation of the line in point-slope form is:

y2=14(x+4)\boxed{y - 2 = \frac{1}{4}(x + 4)}


Would you like further clarification on any part of this?

Here are 5 related questions for additional practice:

  1. What is the equation of a line in point-slope form that passes through (1,3)(1, 3) with a slope of 22?
  2. How would you convert the point-slope form to slope-intercept form?
  3. What is the slope of a line parallel to this line?
  4. If a line passes through (5,1)(5, -1) with slope 35-\frac{3}{5}, what is its point-slope form?
  5. How do you find the slope if only the x- and y-intercepts are given?

Tip: Point-slope form is particularly useful when you know the slope and any point on the line.

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Math Problem Analysis

Mathematical Concepts

Algebra
Linear Equations
Point-Slope Form

Formulas

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

Theorems

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Suitable Grade Level

Grades 8-10