Math Problem Statement

The graph below shows line A and point P. Line B is the straight line that is parallel to line A and passes through point P. Work out the equation of line B. Give your answer in the form y = mx + c, where m and c are integers or fractions in their simplest forms.

Solution

To solve this, we will determine the equation of line BB that is parallel to line AA and passes through point PP. Let’s break it down step by step:

Step 1: Identify the slope (mm) of line AA

  • From the graph, we can observe that line AA goes through two points: (8,5)(-8, -5) and (0,1)(0, -1).
  • Using the slope formula: m=y2y1x2x1m = \frac{y_2 - y_1}{x_2 - x_1} Substituting the points: m=1(5)0(8)=1+58=48=12m = \frac{-1 - (-5)}{0 - (-8)} = \frac{-1 + 5}{8} = \frac{4}{8} = \frac{1}{2}

Step 2: Write the equation of line BB

Since line BB is parallel to line AA, it has the same slope m=12m = \frac{1}{2}. Line BB passes through point P=(3,2)P = (-3, 2). Using the point-slope form of a line: yy1=m(xx1)y - y_1 = m(x - x_1) Substituting m=12m = \frac{1}{2}, x1=3x_1 = -3, and y1=2y_1 = 2: y2=12(x(3))y - 2 = \frac{1}{2}(x - (-3)) y2=12(x+3)y - 2 = \frac{1}{2}(x + 3) Simplify: y2=12x+32y - 2 = \frac{1}{2}x + \frac{3}{2} y=12x+32+2y = \frac{1}{2}x + \frac{3}{2} + 2 Convert 22 to a fraction with a denominator of 2: y=12x+32+42y = \frac{1}{2}x + \frac{3}{2} + \frac{4}{2} y=12x+72y = \frac{1}{2}x + \frac{7}{2}

Final Answer:

The equation of line BB is: y=12x+72y = \frac{1}{2}x + \frac{7}{2}

Would you like me to clarify any of the steps or go into further details?


Here are some related questions:

  1. How do you find the equation of a perpendicular line?
  2. How do you convert between different forms of linear equations?
  3. What is the significance of the slope in real-world scenarios?
  4. How do you find the intersection of two lines given their equations?
  5. How do you graph a line using its slope and yy-intercept?

Tip: When writing equations, always simplify fractions to their lowest terms for clarity and accuracy.

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Math Problem Analysis

Mathematical Concepts

Linear Equations
Parallel Lines
Slope-Intercept Form

Formulas

Slope formula: m = (y2 - y1) / (x2 - x1)
Point-slope form: y - y1 = m(x - x1)

Theorems

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Suitable Grade Level

Grades 8-10