Math Problem Statement

Which of the following linear equations represents a line that passes through the point (-3, 3) and is parallel to the given line?

Solution

We are tasked with determining which of the given linear equations represents a line that passes through the point (-3, 3) and is parallel to the line shown in the graph.

Step 1: Analyze the slope of the given line in the graph.

The given line in the graph passes through the points (-5, 4) and (0, -1). We can calculate the slope mm using the slope formula:

m=y2y1x2x1m = \frac{y_2 - y_1}{x_2 - x_1}

For points (-5, 4) and (0, -1):

m=140(5)=55=1m = \frac{-1 - 4}{0 - (-5)} = \frac{-5}{5} = -1

So, the slope of the line in the graph is 1-1.

Step 2: Identify the slope of a parallel line.

For a line to be parallel, it must have the same slope. Therefore, we are looking for a line with slope 1-1 that passes through the point (-3, 3).

Step 3: Test each equation.

Now, let's look at the options:

A. y=32x+1y = \frac{3}{2}x + 1 → slope is 32\frac{3}{2} (Not parallel) B. y=32x1y = \frac{3}{2}x - 1 → slope is 32\frac{3}{2} (Not parallel) C. y=23x1y = -\frac{2}{3}x - 1 → slope is 23-\frac{2}{3} (Not parallel) D. y=x+1y = -x + 1 → slope is 1-1 (Parallel)

So, option D has the correct slope.

Step 4: Verify that the line passes through (-3, 3).

Let's check if the point (-3, 3) satisfies the equation y=x+1y = -x + 1.

Substitute x=3x = -3 into the equation:

y=(3)+1=3+1=4y = -(-3) + 1 = 3 + 1 = 4

This does not match the y-coordinate of the point (-3, 3), so option D is incorrect.

Step 5: Equation of the correct line.

We know the slope is 1-1 and the line must pass through (-3, 3). Using the point-slope form of the equation:

yy1=m(xx1)y - y_1 = m(x - x_1) where m=1m = -1 and (x1,y1)=(3,3)(x_1, y_1) = (-3, 3):

y3=1(x+3)y - 3 = -1(x + 3)

Simplifying:

y3=x3y - 3 = -x - 3 y=xy = -x

Thus, the equation of the line is y=xy = -x, which is not directly listed among the options.

The correct answer is not given explicitly in the options. Would you like further clarification or a different approach?

Here are some related questions:

  1. How do you determine the slope of a line graphically?
  2. What is the point-slope form of a linear equation?
  3. How do parallel lines behave in terms of their slopes?
  4. What are the steps to find the equation of a line passing through a given point?
  5. How can you convert the point-slope form to slope-intercept form?

Tip: When solving for the equation of a line, always remember that parallel lines have identical slopes.

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Math Problem Analysis

Mathematical Concepts

Algebra
Linear Equations
Slope
Parallel Lines

Formulas

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

Theorems

Parallel lines have the same slope.

Suitable Grade Level

Grades 9-12