Math Problem Statement

Hver er jafna línunnar á myndinni hér fyrir neðan?

Select one:

F

G

H

I

Hver er jafna línunnar á myndinni hér fyrir neðan? Select one: F y = -1.5x + 3 G y = 2x - 1.5 H y = 3x + 2 I y = 2x + 3

Solution

The equation of the line shown in the graph appears to have a positive slope, crossing the y-axis above the origin.

Looking at the options:

  • F) y=1.5x+3y = -1.5x + 3 - This equation has a negative slope, so it does not match.
  • G) y=2x1.5y = 2x - 1.5 - This equation has a positive slope, but it appears to cross the y-axis at 1.5-1.5, which does not match the graph.
  • H) y=3x+2y = 3x + 2 - This equation has a steep positive slope, but the y-intercept is 2.
  • I) y=2x+3y = 2x + 3 - This equation has a positive slope of 2 and crosses the y-axis at 3, which matches the graph.

The correct answer is I) y=2x+3y = 2x + 3.

Would you like more details on why this is the case?

Here are five questions for further exploration:

  1. What is the significance of the slope in a linear equation?
  2. How does changing the y-intercept affect the graph of a line?
  3. How do you determine the slope of a line from a graph?
  4. What other forms can linear equations be written in besides slope-intercept form?
  5. How can you tell if two lines are parallel by looking at their equations?

Tip: The slope of a line represents its steepness, and it can be found by dividing the change in y by the change in x (rise over run).

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Math Problem Analysis

Mathematical Concepts

Algebra
Linear Equations
Graphing Lines

Formulas

Slope-intercept form y = mx + b

Theorems

Slope-intercept form theorem

Suitable Grade Level

Grades 8-10