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Published byVanessa O’Brien’ Modified over 9 years ago

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Do Now Find the slope of the line passing through the given points. 1)( 3, – 2) and (4, 5) 2)(2, – 7) and (– 1, 4)

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What is the slope of a horizontal line? The line doesn’t rise! All horizontal lines have a slope of 0.

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What is the slope of a vertical line? The line doesn’t run! All vertical lines have an undefined slope.

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Find the slope of the line passing through the two given points. 1)(-3,5) and (-3,1) 2)(4, 6) and (1,6)

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The line passing through the points (2, 8) and (6, k) has a slope of. Find k.

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The line passing through the points (5, – 8) and (3, a) has a slope of 4. Find a.

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Slope – Intercept Form y = mx + b m represents the slope of the line b represents the y-intercept The y-intercept is the point where the line crosses the y-axis.

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Write a slope-intercept equation of the line with the given slope and y-intercept. 1)m = 2, b = – 3 2)m = – 4, b = 5 3)m =, b = 0

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4) Write the equation of a line that has a y-intercept of -3 and a slope of -4. 1.y = -3x – 4 2.y = -4x – 3 3.y = -3x + 4 4.y = -4x + 3

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Find the slope and y-intercept for each line. 5)y = 4x – 1 6) y = – x + 3 7)y = 2x – 5

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8) Find the slope and y-intercept of y = -2x + 4 1.m = 2; b = 4 2.m = 4; b = 2 3.m = -2; b = 4 4.m = 4; b = -2

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Writing Equations From The Graph Use the graph to find the slope and y- intercept. 1)Use two points to find the slope. 2)Look where the line crosses the y-axis. 3)Substitute into y = mx + b

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1) Write the equation of the line.

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2) Write the equation of the line.

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