Math Problem Statement

Graph the line y - 1 = -5(x + 4) by selecting points on the graph.

Solution

To graph the line given by the equation:

y1=5(x+4)y - 1 = -5(x + 4)

we first rearrange it into slope-intercept form, y=mx+by = mx + b.

Step 1: Distribute and Simplify

Rewrite the equation:

y1=5(x+4)y - 1 = -5(x + 4) y1=5x20y - 1 = -5x - 20

Now, add 1 to both sides to solve for yy:

y=5x19y = -5x - 19

This is now in the form y=mx+by = mx + b, where the slope m=5m = -5 and the y-intercept b=19b = -19.

Step 2: Plot the Line

  1. Identify the y-intercept: The y-intercept is at (0,19)(0, -19), which would be far down the graph. However, we can use the slope to find additional points that fall within the visible grid.

  2. Use the Slope to Find Points: Since the slope m=5m = -5, this means for every 1 unit you move to the right (increase in xx), you move 5 units down (decrease in yy).

  3. Plot Points:

    • Start at a more manageable point such as x=4x = -4, as this would simplify calculations within the visible grid.
    • When x=4x = -4: y=5(4)19=2019=1y = -5(-4) - 19 = 20 - 19 = 1 So, one point on the line is (4,1)(-4, 1).
    • Using the slope, move one unit to the right to x=3x = -3, and go down 5 units: (3,4)(-3, -4)
    • Continue using this pattern if needed to plot further points.

You can now plot these points on the graph and draw a line through them to represent the equation y1=5(x+4)y - 1 = -5(x + 4).

Would you like further details on how to use these points, or do you have other questions?

Here are some questions that might deepen understanding:

  1. How does changing the slope affect the steepness of the line?
  2. What would happen if we changed the y-intercept value?
  3. How can we find the x-intercept from this equation?
  4. How does graphing with a positive slope differ from a negative one?
  5. What does the equation tell us about the direction of the line?

Tip: When dealing with large intercepts that go off the grid, use the slope to find accessible points on the graph.

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Math Problem Analysis

Mathematical Concepts

Algebra
Linear Equations
Graphing

Formulas

Slope-intercept form y = mx + b

Theorems

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Suitable Grade Level

Grades 8-10