Use the given conditions to write an equation for each line in point-slope form and general form. Passing through (5, −9) and perpendicular to the line whose equation is x + 7y - 12= 0
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2. Graphs of Equations
Lines
Problem 78
Textbook Question
Give the slope and y-intercept of each line whose equation is given. Assume that B ≠ 0. Ax = By - C
Verified step by step guidance1
Start with the given equation: \(Ax = By - C\).
Rearrange the equation to solve for \(y\) in terms of \(x\). Add \(C\) to both sides and then divide both sides by \(B\):
\(By = Ax + C \implies y = \frac{A}{B}x + \frac{C}{B}\).
Identify the slope \(m\) from the equation in slope-intercept form \(y = mx + b\). Here, the slope is \(m = \frac{A}{B}\).
Identify the y-intercept \(b\) from the equation. The y-intercept is the constant term \(b = \frac{C}{B}\).
Summarize: The slope of the line is \(\frac{A}{B}\) and the y-intercept is \(\frac{C}{B}\).
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Slope-Intercept Form of a Line
The slope-intercept form of a line is y = mx + b, where m represents the slope and b represents the y-intercept. Converting a given equation into this form helps identify these values directly.
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Graphing Lines in Slope-Intercept Form
Rearranging Linear Equations
To find the slope and y-intercept from an equation like Ax = By - C, you must isolate y on one side. This involves algebraic manipulation such as adding, subtracting, and dividing terms to rewrite the equation in slope-intercept form.
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Slope and Y-Intercept Definitions
The slope measures the steepness of a line, calculated as the ratio of vertical change to horizontal change. The y-intercept is the point where the line crosses the y-axis, found by setting x = 0 in the equation.
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Slope-Intercept Form
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