Math Problem Statement

The equation of line v is y = -9x + 1. Line w is perpendicular to line v and passes through (3, -2). What is the equation of line w?

Solution

To find the equation of line ww, which is perpendicular to line vv with the equation y=9x+1y = -9x + 1 and passes through the point (3,2)(3, -2), let's go through the following steps:

Step 1: Find the Slope of Line vv

The equation of line vv is given in slope-intercept form: y=mx+by = mx + b, where mm is the slope and bb is the y-intercept.

For vv: m=9m = -9

Step 2: Find the Slope of Line ww (Perpendicular Slope)

Since line ww is perpendicular to line vv, the slope of ww will be the negative reciprocal of the slope of vv.

Thus, the slope of ww is: mw=19m_w = \frac{1}{9}

Step 3: Use the Point-Slope Form to Find the Equation of Line ww

Line ww passes through the point (3,2)(3, -2), and its slope is 19\frac{1}{9}. We can use the point-slope form of the equation of a line: yy1=m(xx1)y - y_1 = m(x - x_1) where (x1,y1)=(3,2)(x_1, y_1) = (3, -2) and m=19m = \frac{1}{9}.

Substitute these values: y(2)=19(x3)y - (-2) = \frac{1}{9}(x - 3) y+2=19x13y + 2 = \frac{1}{9}x - \frac{1}{3}

Step 4: Simplify to Slope-Intercept Form

Now, isolate yy to put it in slope-intercept form (y=mx+by = mx + b):

y=19x132y = \frac{1}{9}x - \frac{1}{3} - 2

Convert 2-2 to a fraction with a denominator of 3: y=19x1363y = \frac{1}{9}x - \frac{1}{3} - \frac{6}{3} y=19x73y = \frac{1}{9}x - \frac{7}{3}

Final Answer

The equation of line ww in slope-intercept form is: y=19x73y = \frac{1}{9}x - \frac{7}{3}

Would you like further details on any of these steps or have additional questions?

Here are five related questions to deepen your understanding:

  1. How would the equation change if line ww passed through a different point?
  2. What if line ww was parallel to line vv instead of perpendicular?
  3. Can we derive the equation of a perpendicular line in other forms besides slope-intercept?
  4. How can we verify if two lines are perpendicular?
  5. What is the significance of the y-intercept in interpreting the graph of line ww?

Tip: Always remember that perpendicular lines have slopes that are negative reciprocals of each other!

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Math Problem Analysis

Mathematical Concepts

Algebra
Linear Equations
Slope-Intercept Form
Point-Slope Form
Perpendicular Slopes

Formulas

Slope-Intercept Form (y = mx + b)
Point-Slope Form (y - y1 = m(x - x1))

Theorems

Properties of Perpendicular Lines

Suitable Grade Level

Grades 8-10