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Sect P-4. Lines in the Plane. Slope of a line. If the line is vertical , the slope is “ undefined ”. Find the slope…. Passes through (-1,2) and (4,2) . Point-Slope Form of the Line. Find the Point-Slope Form. Line passes through (-3,-4) with a slope of 2. Slope-Intercept Form.

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## Sect P-4

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**Sect P-4**Lines in the Plane**Slope of a line**If the line is vertical, the slope is “undefined”**Find the slope…**• Passes through (-1,2) and (4,2)**Find the Point-Slope Form**• Line passes through (-3,-4) with a slope of 2**Slope-Intercept Form**• Y-intercept: the point where the line crosses (intersects) the y-axis • It will always cross at x=0. • y=mx + b m = slope of line b = the y value of the y-intercept of line… y-intercept is (0,b)**Using the Slope-Intercept Form**• Write the equation of the line with slope 3 that passes through (-1,6)**Forms of the Equation of Lines**• Standard Form: • Slope-Intercept: • Point-Slope: • Vertical Line: • Horizontal Line:**Graphing Linear Equations**• The “graph” is all pairs (x,y) that are solutions to the equation. • (2,1) is “one” solution to 2x + 3y = 8 • Substituting x=2 and y = 1 into the equation will give the answer 8. • There are infinitely many points on the graph.**Graphing Linear Equations**• Using Calculator • Solve the equation for y= • Enter into y= screen on calculator • Hit “graph” • Note: the graph window may need to be changed to view the parts needed.**Parallel Lines**• What do graphs of y = mx + b and y = mx + c have in common? How are they different?**Perpendicular Lines**• Graph y = 2x and y = - (1/2)x in a “square” viewing window. • Estimate the angle between the lines. • What can you say about the “slopes” of the two lines?**Definitions…**• Two non-vertical lines are “parallel” if and only if they have the same slope. • Two non-vertical lines are “perpendicular” if and only if their slopes m1 and m2 are “opposite reciprocals” of each other.**Homework… P. 35**• Quick Review … 2,6,8 • Exercises …6, 10, 14, 18, 24, 34 (using calculator on 34 only)**Find the Equation of Perpendicular Line**• Given a line 4x + y = 3 • Find the equation of the perpendicular line that passes through (2,-3)**Applying Linear Equations**• Camelot Apartments purchased a $50,000 building and depreciates it (for tax purposes) $2000 per year over a 25 year period. • Write the equation showing the value of the building (for tax purposes) in terms of years after the purchase. • In how many years will the value be $24,500?

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