Math Problem Statement

Graph the plane curve given by the parametric equations x = (1/4)t and y = 3t - 8, where -3 ≤ t ≤ 3. Then find an equivalent rectangular equation and choose the correct graph from the options.

Solution

The problem involves graphing the parametric equations x=14tx = \frac{1}{4}t and y=3t8y = 3t - 8, and then converting these parametric equations to an equivalent rectangular equation.

Step 1: Eliminate the parameter tt

We need to express xx and yy in terms of one another by solving for tt from one equation and substituting it into the other.

  1. From x=14tx = \frac{1}{4}t, solve for tt: t=4xt = 4x

  2. Substitute t=4xt = 4x into y=3t8y = 3t - 8: y=3(4x)8y = 3(4x) - 8 Simplify: y=12x8y = 12x - 8

Step 2: Determine the range of xx and yy

The parameter tt is given to be in the range 3t3-3 \leq t \leq 3.

  • Using t=4xt = 4x: 34x3    34x34-3 \leq 4x \leq 3 \implies -\frac{3}{4} \leq x \leq \frac{3}{4}

  • Calculate the corresponding yy-values using y=12x8y = 12x - 8: When x=34,y=12(34)8=98=17\text{When } x = -\frac{3}{4}, \, y = 12\left(-\frac{3}{4}\right) - 8 = -9 - 8 = -17 When x=34,y=12(34)8=98=1\text{When } x = \frac{3}{4}, \, y = 12\left(\frac{3}{4}\right) - 8 = 9 - 8 = 1

So, the line y=12x8y = 12x - 8 is graphed for 34x34-\frac{3}{4} \leq x \leq \frac{3}{4}, and yy ranges from 17-17 to 11.

Step 3: Match with the given graphs

Looking at the graphs:

  • The correct graph should represent a line with a slope of 12, passing through (x,y)=(0,8)(x, y) = (0, -8) (the yy-intercept), and restricted to the intervals derived above.

Correct Answer:

The correct graph matches Option C. It shows the line segment y=12x8y = 12x - 8 with the correct slope and bounds.


Would you like a more detailed explanation of any step? Here are related questions to expand on this concept:

  1. How do you graph a line given a parametric equation?
  2. What are other methods to eliminate the parameter tt in parametric equations?
  3. Can all parametric equations be converted to rectangular form?
  4. How do parametric restrictions influence the graph of a line?
  5. What is the significance of slope and yy-intercept in linear equations?

Tip: Always check the bounds of your parametric equations to correctly limit the graph to the defined segment.

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Math Problem Analysis

Mathematical Concepts

Parametric Equations
Graphing Lines
Linear Equations
Elimination of Parameter

Formulas

x = (1/4)t
y = 3t - 8
Rectangular equation: y = 12x - 8

Theorems

Linear Equation Slope-Intercept Form

Suitable Grade Level

Grades 10-12