Math Problem Statement

What is the answer

Write an equation for the graph below in terms of x.

Solution

The task is to write the equation of the line shown on the graph in terms of xx. Let’s work through this step by step:

Step 1: Find the slope (mm) of the line

To determine the slope, we use the formula: m=y2y1x2x1m = \frac{y_2 - y_1}{x_2 - x_1} From the graph:

  • Choose two clear points on the line. For example:
    • Point 1: (3,3)(-3, -3)
    • Point 2: (3,3)(3, 3)

Substitute these into the formula: m=3(3)3(3)=66=1m = \frac{3 - (-3)}{3 - (-3)} = \frac{6}{6} = 1 So, the slope of the line is m=1m = 1.


Step 2: Use the slope-intercept form (y=mx+by = mx + b)

The slope-intercept form of a line is: y=mx+by = mx + b Now substitute m=1m = 1: y=x+by = x + b


Step 3: Find the yy-intercept (bb)

The yy-intercept is the point where the line crosses the yy-axis (x=0x = 0). From the graph, the line crosses the yy-axis at (0,0)(0, 0). Thus, b=0b = 0.


Final Equation:

Substitute b=0b = 0 into the equation: y=xy = x


Answer:

y=x\boxed{y = x}

Would you like a detailed explanation of how to identify slope or intercept? Let me know if you have any further questions!


Related Questions:

  1. How do you find the slope of a line from a graph?
  2. What is the general form of a linear equation?
  3. How do you determine the yy-intercept from a graph?
  4. Can the slope of a line be negative? How does it affect the graph?
  5. How would the equation change if the line were parallel to this one but passed through a different point?

Tip:

Always double-check your chosen points for slope calculation to avoid errors!

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Math Problem Analysis

Mathematical Concepts

Algebra
Linear Equations
Graphing

Formulas

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

Theorems

Properties of linear functions

Suitable Grade Level

Grades 8-10