Write an equation in point-slope form and slope-intercept form of the line passing through (-10,3) and (-2,-5).
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Problem 53
Textbook Question
Write an equation (a) in standard form and (b) in slope-intercept form for each line described. through (1, 6), perpendicular to 3x+5y=1
Verified step by step guidance1
Identify the slope of the given line by rewriting the equation \$3x + 5y = 1\( in slope-intercept form \)y = mx + b\(. To do this, solve for \)y\(: subtract \)3x\( from both sides to get \)5y = -3x + 1\(, then divide both sides by 5 to get \)y = -\frac{3}{5}x + \frac{1}{5}\(. The slope \)m\( of the given line is \)-\frac{3}{5}$.
Find the slope of the line perpendicular to the given line. Recall that perpendicular slopes are negative reciprocals of each other. So, if the original slope is \(-\frac{3}{5}\), the perpendicular slope \(m_{\perp}\) is \(\frac{5}{3}\).
Use the point-slope form of a line equation with the point \((1, 6)\) and the perpendicular slope \(\frac{5}{3}\). The point-slope form is \(y - y_1 = m(x - x_1)\), so substitute to get \(y - 6 = \frac{5}{3}(x - 1)\).
Convert the point-slope form to slope-intercept form \(y = mx + b\) by distributing the slope and isolating \(y\). This will give the equation in slope-intercept form.
Rewrite the slope-intercept form into standard form \(Ax + By = C\) by moving all terms to one side and clearing any fractions by multiplying through by the denominator to get integer coefficients.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Standard Form of a Linear Equation
The standard form of a linear equation is written as Ax + By = C, where A, B, and C are integers, and A and B are not both zero. This form is useful for quickly identifying intercepts and for certain algebraic manipulations.
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Standard Form of Line Equations
Slope of a Line and Perpendicular Lines
The slope of a line measures its steepness and is found by rewriting the equation in slope-intercept form or using coefficients. Lines are perpendicular if their slopes are negative reciprocals, meaning the product of their slopes is -1.
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Parallel & Perpendicular Lines
Slope-Intercept Form of a Linear Equation
The slope-intercept form is y = mx + b, where m is the slope and b is the y-intercept. This form clearly shows the slope and where the line crosses the y-axis, making it easy to graph and understand the line's behavior.
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Slope-Intercept Form
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