Table of contents
- 0. Review of Algebra4h 16m
- 1. Equations & Inequalities3h 18m
- 2. Graphs of Equations43m
- 3. Functions2h 17m
- 4. Polynomial Functions1h 44m
- 5. Rational Functions1h 23m
- 6. Exponential & Logarithmic Functions2h 28m
- 7. Systems of Equations & Matrices4h 6m
- 8. Conic Sections2h 23m
- 9. Sequences, Series, & Induction1h 19m
- 10. Combinatorics & Probability1h 45m
2. Graphs of Equations
Lines
Problem 66a
Textbook Question
For each line described, write an equation in(a)slope-intercept form, if possible, and(b)standard form. through (0, 5), perpendicular to 8x+5y=3
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1
Identify the slope of the given line by rewriting the equation \(8x + 5y = 3\) in slope-intercept form \(y = mx + b\).
The slope-intercept form is \(y = -\frac{8}{5}x + \frac{3}{5}\), so the slope \(m\) is \(-\frac{8}{5}\).
Find the slope of the line perpendicular to the given line. The perpendicular slope is the negative reciprocal of \(-\frac{8}{5}\), which is \(\frac{5}{8}\).
Use the point-slope form \(y - y_1 = m(x - x_1)\) with the point \((0, 5)\) and the perpendicular slope \(\frac{5}{8}\) to write the equation.
Convert the equation from point-slope form to both slope-intercept form \(y = mx + b\) and standard form \(Ax + By = C\).
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Slope-Intercept Form
The slope-intercept form of a linear equation is expressed as y = mx + b, where m represents the slope of the line and b is the y-intercept. This form is useful for quickly identifying the slope and y-intercept, making it easier to graph the line. To convert an equation into this form, one typically solves for y.
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Standard Form
The standard form of a linear equation is given by Ax + By = C, where A, B, and C are integers, and A should be non-negative. This form is beneficial for analyzing the relationship between x and y and is often used in systems of equations. To convert from slope-intercept form to standard form, rearranging the equation is necessary.
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Standard Form of Polynomials
Perpendicular Lines
Two lines are perpendicular if the product of their slopes is -1. This means that if one line has a slope of m, the slope of the line perpendicular to it will be -1/m. Understanding this concept is crucial for finding the slope of the line that is perpendicular to a given line, which is necessary for solving the problem at hand.
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