Math Problem Statement

Determine the slope and the equation of the line shown in the graph.

Solution

This graph shows a straight line with a negative slope, indicating that as xx increases, yy decreases. Let's determine the slope and the equation of the line.

1. Slope Calculation

To find the slope mm, we can use two points the line passes through. From the graph, the line passes through:

  • Point (4,4)(-4, 4)
  • Point (4,2)(4, -2)

The formula for slope is:

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

Substituting the points (4,4)(-4, 4) and (4,2)(4, -2):

m=244(4)=68=34m = \frac{-2 - 4}{4 - (-4)} = \frac{-6}{8} = -\frac{3}{4}

2. Equation of the Line

The slope-intercept form of a line is:

y=mx+by = mx + b

Using the slope m=34m = -\frac{3}{4} and one point, let's substitute point (4,2)(4, -2) into the equation to find bb (the y-intercept):

2=34(4)+b-2 = -\frac{3}{4}(4) + b

Simplifying:

2=3+b-2 = -3 + b b=1b = 1

Thus, the equation of the line is:

y=34x+1y = -\frac{3}{4}x + 1

Summary:

  • Slope: 34-\frac{3}{4}
  • Equation of the line: y=34x+1y = -\frac{3}{4}x + 1

Would you like further details or explanations?

Here are some related questions:

  1. How would the line change if the slope was positive instead of negative?
  2. What is the significance of the y-intercept in the equation of a line?
  3. How would you convert this equation into standard form Ax+By=CAx + By = C?
  4. What is the relationship between parallel lines and their slopes?
  5. How does the steepness of a line relate to the absolute value of its slope?

Tip: When interpreting a graph, remember that negative slopes always indicate that the line falls as xx increases!

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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

Slope of a line
Equation of a straight line

Suitable Grade Level

Grades 8-10