Math Problem Statement

What is the equation of the line that passes through the points (-4, 1) and (10, 10)?

Solution

The question asks for the equation of the line passing through the points (4,1)(-4, 1) and (10,10)(10, 10). Here's the solution:


Step 1: Find the slope (m)

The formula for the slope is:

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

Substitute (x1,y1)=(4,1)(x_1, y_1) = (-4, 1) and (x2,y2)=(10,10)(x_2, y_2) = (10, 10):

m=10110(4)=914m = \frac{10 - 1}{10 - (-4)} = \frac{9}{14}

So, the slope m=914m = \frac{9}{14}.


Step 2: Use the point-slope form

The point-slope form of a line is:

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

Substitute m=914m = \frac{9}{14}, and use the point (4,1)(-4, 1):

y1=914(x(4))y - 1 = \frac{9}{14}(x - (-4))

Simplify:

y1=914(x+4)y - 1 = \frac{9}{14}(x + 4)

y1=914x+3614y - 1 = \frac{9}{14}x + \frac{36}{14}

y1=914x+187y - 1 = \frac{9}{14}x + \frac{18}{7}

Add 11 to both sides:

y=914x+187+1y = \frac{9}{14}x + \frac{18}{7} + 1

Convert 11 to a fraction with denominator 7:

y=914x+187+77y = \frac{9}{14}x + \frac{18}{7} + \frac{7}{7}

y=914x+257y = \frac{9}{14}x + \frac{25}{7}


Final Equation

The equation of the line is:

y=914x+257y = \frac{9}{14}x + \frac{25}{7}


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

  1. How do you find the slope if the two points are vertically aligned?
  2. How do you convert the equation to standard form Ax+By=CAx + By = C?
  3. What is the y-intercept of the line, and how is it calculated?
  4. How can you verify if another point lies on this line?
  5. How do you find the equation of a line parallel to this one?

Tip: Always check your slope calculation carefully, as small sign errors can lead to incorrect results.

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Math Problem Analysis

Mathematical Concepts

Linear Equations
Slope
Point-Slope Form
Algebra

Formulas

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

Theorems

Slope of a line theorem

Suitable Grade Level

Grades 8-10