Math Problem Statement

Write an equation for the line

Write an equation for the line

Solution

To write the equation of the line from the graph, we need to find its slope and y-intercept.

From the image, I can see that the line passes through certain points. Let’s break this down:

  1. Identify two points on the line:

    • From the graph, we can observe the line crosses at the point (-4, 3) and (0, 5).
  2. Find the slope (m): The slope formula is:

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

    Using the points (-4, 3) and (0, 5):

    m=530(4)=24=12m = \frac{5 - 3}{0 - (-4)} = \frac{2}{4} = \frac{1}{2}

  3. Write the equation using the point-slope form: The point-slope form of a line is:

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

    Using the point (0, 5) and slope m=12m = \frac{1}{2}:

    y5=12(x0)y - 5 = \frac{1}{2}(x - 0)

    Simplifying this:

    y5=12xy - 5 = \frac{1}{2}x

    y=12x+5y = \frac{1}{2}x + 5

Thus, the equation of the line is:

y=12x+5y = \frac{1}{2}x + 5

Would you like a more detailed explanation or help with any other questions? Here are a few related questions:

  1. How do you calculate the slope of a line when two points are given?
  2. What is the difference between the point-slope form and slope-intercept form of a line?
  3. How can you identify the y-intercept from a graph?
  4. Can this line be written in standard form?
  5. How do you graph an equation like y=12x+5y = \frac{1}{2}x + 5?

Tip: To determine the slope quickly, always try to pick points with integer coordinates to simplify the calculations!

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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 form of a line

Suitable Grade Level

Grades 8-10