Math Problem Statement

Answer

Lynda cuts a piece of wood for a project. The first cut is shown and can be represented by the equation y = 1/2x - 5. The second cut needs to be parallel to the first. It will pass through the point (0, 4). Identify the equation that represents Lynda's second cut.

Solution

The problem involves finding the equation of a line that is parallel to the given line y=12x5y = \frac{1}{2}x - 5 and passes through the point (0,4)(0, 4).

Step-by-step Solution:

  1. Parallel Lines:

    • Parallel lines have the same slope. The slope of the given line y=12x5y = \frac{1}{2}x - 5 is 12\frac{1}{2}.
    • So, the new line that is parallel to this will also have the slope 12\frac{1}{2}.
  2. Point-Slope Form:

    • We know the slope is 12\frac{1}{2}, and the new line passes through the point (0,4)(0, 4).
    • Using the slope-intercept form y=mx+by = mx + b, where mm is the slope and bb is the y-intercept, we substitute x=0x = 0 and y=4y = 4 to find the new bb.
  3. Find the y-intercept:

    • Substituting into the equation: y=12x+by = \frac{1}{2}x + b 4=12(0)+b4 = \frac{1}{2}(0) + b b=4b = 4
    • So, the equation of the line is: y=12x+4y = \frac{1}{2}x + 4
  4. Conclusion:

    • The equation that represents Lynda’s second cut is y=12x+4y = \frac{1}{2}x + 4, which matches option B.

Thus, the correct answer is B.

Would you like further details or clarifications?

Related Questions:

  1. How do we calculate the slope of a line given two points?
  2. How can you verify if two lines are parallel?
  3. What are the characteristics of perpendicular lines?
  4. How do you find the equation of a line if you are given a slope and a point?
  5. What is the difference between slope-intercept form and point-slope form?

Tip: Always remember that parallel lines have the same slope, while perpendicular lines have slopes that are negative reciprocals of each other.

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Math Problem Analysis

Mathematical Concepts

Parallel Lines
Slope-Intercept Form
Algebra

Formulas

y = mx + b (Slope-Intercept Form)
Equation of parallel lines has the same slope

Theorems

Parallel Lines Theorem: Parallel lines have the same slope

Suitable Grade Level

Grades 7-10