Y The graph of a rule connecting x and y is shown. From the graph, when x is -1, what is y? Give me a value of x that makes y positive, negative, equal.

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Presentation transcript:

y The graph of a rule connecting x and y is shown. From the graph, when x is -1, what is y? Give me a value of x that makes y positive, negative, equal to 0. x

The rule is y = x3 + 2x2 – 8x If x = -4, what is x3 + 2x2 – 8x? When is x3 + 2x2 – 8x = 16? We can use the graph to solve equations. x

The rule is y = -x2 - 2x + 3 Solve -x2 - 2x + 3 = 4 -x2 - 2x + 3 = 0 y

What is the maximum value of The rule is y = -x2 - 2x + 3 y What is the maximum value of -x2 - 2x + 3? x

y = 3 – 2x y = 2x + 1 Here are the graphs of 2 rules. When does 3 – 2x = 5 ? 2x + 1 = 0 ?

Here are the graphs of 2 rules. y = 3 – 2x y = 2x + 1 Here are the graphs of 2 rules. When does 3 – 2x = 2? 2x + 1 = 2? 3 – 2x = 2x + 1 ?