Math Problem Statement

How to graph the following linear equations: y = -3/4x + 2, y = 2/5x + 5, y = -4/5x - 1, y = -3x + 1, y = 2x, y = 4?

Solution

The image contains a set of linear equations, each paired with a blank graph. I will now explain how to graph each equation and the steps involved.

Equation 29: y=34x+2y = -\frac{3}{4}x + 2

  • Slope = 34-\frac{3}{4}: The line will decrease by 3 units vertically for every 4 units it moves to the right.
  • Y-intercept = 2: The point where the line crosses the y-axis is at (0, 2).
  • Steps:
    1. Start at (0, 2).
    2. From (0, 2), move down 3 units and right 4 units to plot another point at (4, -1).
    3. Draw a line through the points.

Equation 30: y=25x+5y = \frac{2}{5}x + 5

  • Slope = 25\frac{2}{5}: The line increases by 2 units for every 5 units to the right.
  • Y-intercept = 5: The point where the line crosses the y-axis is (0, 5).
  • Steps:
    1. Start at (0, 5).
    2. Move up 2 units and right 5 units to plot another point at (5, 7).
    3. Draw the line through these points.

Equation 31: y=45x1y = -\frac{4}{5}x - 1

  • Slope = 45-\frac{4}{5}: The line decreases by 4 units for every 5 units to the right.
  • Y-intercept = -1: The line crosses the y-axis at (0, -1).
  • Steps:
    1. Start at (0, -1).
    2. Move down 4 units and right 5 units to plot a point at (5, -5).
    3. Draw the line through these points.

Equation 32: y=3x+1y = -3x + 1

  • Slope = -3: The line decreases by 3 units for every 1 unit to the right.
  • Y-intercept = 1: The line crosses the y-axis at (0, 1).
  • Steps:
    1. Start at (0, 1).
    2. Move down 3 units and right 1 unit to plot another point at (1, -2).
    3. Draw the line through these points.

Equation 33: y=2xy = 2x

  • Slope = 2: The line increases by 2 units for every 1 unit to the right.
  • Y-intercept = 0: The line passes through the origin (0, 0).
  • Steps:
    1. Start at (0, 0).
    2. Move up 2 units and right 1 unit to plot a point at (1, 2).
    3. Draw the line through these points.

Equation 34: y=4y = 4

  • This is a horizontal line where y=4y = 4, meaning the line passes through all points where the y-coordinate is 4.
  • Steps:
    1. Plot a horizontal line across the graph at y=4y = 4.

Would you like me to assist you with graphing any specific equation or provide further details on any part of this process?

5 related questions:

  1. What is the significance of the slope and y-intercept in a linear equation?
  2. How does a negative slope affect the direction of the line?
  3. Can you explain how to identify whether a line is steep or shallow based on its slope?
  4. What happens to the graph of a line if only the y-intercept changes?
  5. How do horizontal and vertical lines differ in their equations?

Tip:

Always start by plotting the y-intercept when graphing a linear equation, as it gives you the starting point for drawing the rest of the line.

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Math Problem Analysis

Mathematical Concepts

Linear Equations
Graphing
Coordinate Geometry
Slope-Intercept Form

Formulas

y = mx + b, where m is the slope and b is the y-intercept

Theorems

Slope-Intercept Form Theorem

Suitable Grade Level

Grade 8