1. Today’s Topics: Writing Equations of Lines Parallel/Perpendicular Average Rate of Change Today’s Topics: Writing Equations of Lines Parallel/Perpendicular Average Rate of Change

2. FormEquationDescription GeneralWhere a, b and c are real numbers, With a and b not both equal to 0. Point-SlopeWhere m is the slope of the line and (x 1, y 1 ) is a point on the line. Slope-InterceptWhere m is the slope of the line and b is the y-intercept. Vertical LineWhere a is a constant and a is the x- coordinate of any point on the line. The slope is undefined. HorizontalWhere b is a constant and b is the y- coordinate of any point on the line. The slope is 0.

3. A.Write an equation for the line that passes through the point (- 1, -5) and has slope__________. B.Write an equation for the line that passes through the points (__, 3) and (2, __). C.Write and equation for the line that pass through the point (-1, 5) and has a slope of ________. What would the equation be if the slope was undefined? D.Write the equation of the line with slope of 4 and y-intercept of ____.

4. Internet Advertising The amount spent on Internet advertising was $22.7 billion in 2009 and is expected to grow at a rate of $2.25 billion per year for the next five years. A._____________________for the amount of Internet advertising spending as a function of the number of years after 2009. B.Use the function to estimate the amount that will be spent on internet advertising in ____________.

5. Parallel Lines have the ___________ slope. Perpendicular Lines have slopes that are __________ __________ of each other. Parallel Lines have the ___________ slope. Perpendicular Lines have slopes that are __________ __________ of each other. A.Write the equation of the line through (____, ____) and parallel to the line with the equation _______________. B.Write the equation of the line through (___, _____) and perpendicular to the line with the equation ___________.

6. The average rate of change between two points on its graph is the slope of the line joining the two point. Such a line is called a secant line.

7. For the function shown in the figure, find the average rate of change from point B to point A.

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