Math Problem Statement

b) The lines y = x and y = 2x are shown on the axis below. Write down one similarity and one difference between these lines.

Solution

Let's analyze the image step by step.

Part A: Complete the Table

The equation given is y=2xy = 2x, which describes a linear relationship. To fill in the table, we can substitute the xx-values into the equation to find the corresponding yy-values.

  • When x=2x = -2: y=2(2)=4y = 2(-2) = -4
  • When x=1x = -1: y=2(1)=2y = 2(-1) = -2
  • When x=0x = 0: y=2(0)=0y = 2(0) = 0
  • When x=1x = 1: y=2(1)=2y = 2(1) = 2
  • When x=2x = 2: y=2(2)=4y = 2(2) = 4

Thus, the completed table looks like this:

xx-2-1012
yy-4-2024

The values corresponding to the letters "A" and "B" are:

  • A=0A = 0
  • B=4B = 4

Part B: Similarity and Difference Between the Lines

The two equations are:

  • y=xy = x (red line)
  • y=2xy = 2x (blue line)

Similarity:

Both lines pass through the origin (0,0), meaning they share the same y-intercept. This means both lines start from the same point on the graph.

Difference:

The difference lies in their slopes:

  • The slope of the line y=xy = x is 1.
  • The slope of the line y=2xy = 2x is 2.

This means the line y=2xy = 2x is steeper than the line y=xy = x.

Would you like any further details or have additional questions?

Here are some related questions:

  1. How do you calculate the slope of a line given two points?
  2. How can we determine the y-intercept from an equation?
  3. What does the slope tell us about the steepness of a line?
  4. How can you graph a line using its slope and y-intercept?
  5. How do parallel lines differ from intersecting lines?

Tip: When comparing linear equations, always check both the slope and the y-intercept for differences and similarities.

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Math Problem Analysis

Mathematical Concepts

Linear Equations
Graphing Lines
Slope and Y-Intercept

Formulas

y = mx + b (equation of a line)

Theorems

Slope-Intercept Theorem

Suitable Grade Level

Grades 7-9