Find the average rate of change of f(x) = x^2 - 4x from x_1 = 5 to x_2 = 9.
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2. Graphs of Equations
Lines
Problem 56
Textbook Question
Write an equation (a) in standard form and (b) in slope-intercept form for each line described. through (-2, -2), parallel to y=3
Verified step by step guidance1
Identify the given information: the line passes through the point (-2, -2) and is parallel to the line y = 3.
Recall that the line y = 3 is a horizontal line with slope 0, so any line parallel to it will also have slope 0.
Since the slope is 0, the equation of the line is horizontal and can be written as y = k, where k is the y-coordinate of the point it passes through.
Using the point (-2, -2), substitute the y-coordinate to get the slope-intercept form: y = -2.
To write the equation in standard form, rearrange y = -2 to 0x + 1y = -2, which simplifies to y = -2.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Equation of a Horizontal Line
A horizontal line has a slope of zero and is represented by an equation of the form y = k, where k is a constant. Since the line is parallel to y = 3, it must also be horizontal with the same slope, meaning its equation will have the form y = constant.
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Slope-Intercept Form
The slope-intercept form of a line is y = mx + b, where m is the slope and b is the y-intercept. For horizontal lines, the slope m is zero, so the equation simplifies to y = b, making it easy to write the equation once the y-value is known.
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Standard Form of a Line
The standard form of a linear equation is Ax + By = C, where A, B, and C are integers, and A ≥ 0. For horizontal lines, this form typically looks like 0·x + 1·y = C, which simplifies to y = C, matching the horizontal line's constant y-value.
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