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

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?

WORK WITH A PARTNER…

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

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?

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

SLOPE INTERCEPT FORM OF A LINEAR EQUATION

GRAPH THE EQUATION y = 3x - 1

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.

EXAMPLE Write an equation for the line.

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

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