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Published byAlaina Shaw Modified over 5 years ago

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5-4 SLOPE-INTERCEPT FORM MISS BATTAGLIA – ALGEBRA 1 CP OBJECTIVE: USE THE SLOPE AND Y-INTERCEPT TO DRAW GRAPHS AND WRITE EQUATIONS.

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WARM UP Christina earns an annual salary of $135,000 as a computer chip designer. If she usually works 40 hours per week for 50 weeks per year, how much does Christina earn per hour? Per minute?

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WORK WITH A PARTNER…

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Graph these equations on the same screen. Where does each line cross the y-axis?

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THINK & DISCUSS The point where a line crosses the y-axis is the y-intercept. a)What is the y-intercept of each line? b) Generalize: What is the connection between a line’s equation and its y-intercept?

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THINK & DISCUSS a)What is the slope of each line? b)Generalize: What is the connection between a line’s equation and its slope?

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SLOPE INTERCEPT FORM OF A LINEAR EQUATION

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GRAPH THE EQUATION y = 3x - 1

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JOBS The base pay of a water delivery person is $210 per week. He can also earn 20% commission on any sales he makes. The equation t = 210 + 0.2s relates total earnings t to sales s. Rewrite the equation in slope- intercept form. Then graph the equation.

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EXAMPLE Write an equation for the line.

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HOMEWORK Pg 232 – 234 # 1 – 3, 11, 12 – 14, 22, 27, 28

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