Math Problem Statement

Which is the correct order of the functions from least to greatest y-intercept?

Solution

The problem asks for the correct order of the functions based on their y-intercepts from least to greatest. Let’s examine each function to find their y-intercepts:

Function A:

The equation is given as y=2x+4y = 2x + 4. The y-intercept is the constant term in the slope-intercept form y=mx+by = mx + b, which is 4.

Function B:

We need to calculate the equation of the line passing through the points (2,4)(-2, -4) and (4,14)(4, 14).

  • The slope mm is calculated as: m=y2y1x2x1=14(4)4(2)=186=3m = \frac{y_2 - y_1}{x_2 - x_1} = \frac{14 - (-4)}{4 - (-2)} = \frac{18}{6} = 3
  • Using the point-slope form of a line yy1=m(xx1)y - y_1 = m(x - x_1), substituting m=3m = 3 and (x1,y1)=(2,4)(x_1, y_1) = (-2, -4): y(4)=3(x(2))y - (-4) = 3(x - (-2)) y+4=3(x+2)y + 4 = 3(x + 2) y+4=3x+6y + 4 = 3x + 6 y=3x+2y = 3x + 2 The y-intercept is 2.

Function C:

Looking at the table, the point where x=0x = 0 corresponds to the y-intercept, which is 3.

Now, ordering the y-intercepts:

  • Function B: y-intercept = 2
  • Function C: y-intercept = 3
  • Function A: y-intercept = 4

Thus, the order from least to greatest y-intercept is:

Function B, Function C, Function A\text{Function B, Function C, Function A}

The correct answer is:
Option D: Function B, Function C, Function A.


Would you like more details on any of these steps?

Here are 5 questions for further understanding:

  1. How do you find the slope of a line between two points?
  2. What is the y-intercept, and how can it be determined from a graph or table?
  3. How do you use point-slope form to find the equation of a line?
  4. What are the key differences between the forms of a linear equation?
  5. How does the slope of a line affect its steepness?

Tip: In a linear equation, the y-intercept is where the line crosses the y-axis (when x=0x = 0).

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Math Problem Analysis

Mathematical Concepts

Linear Functions
Y-Intercept
Slope

Formulas

Slope formula: m = (y2 - y1) / (x2 - x1)
Linear equation in slope-intercept form: y = mx + b

Theorems

Point-slope form of a line
Slope-intercept form

Suitable Grade Level

Grades 9-10