IM Unit 4 Lesson 2: Points on a Graph in a Situation

What does the point on the graph where x = 15 mean?

• 20 Degrees

• 15 Degrees

• 21 Degrees

• 15 Hours

What is the temperature at 5 p.m.?

• 12 Degrees

• 20 Degrees

• 17 Hours

• 17 Degrees

What is the hottest it gets on this day?

• 24 Degrees

• 21 Degrees

• 24 Hours

• 21 Hours

Is this a function? Why or Why Not?

• Yes, because it passes the vertical line test.

• No, because it doesn't pass the vertical line test.

• Yes, because it is disconnected points.

• No, because it is disconnected points.

What is the coldest it gets on this day?

• 12 Degrees

• 12 Hours

• 0 Degrees

• 15 Degrees

Find the value of y when x = -2.

y=3x-4

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Answer explanation

3(-2) - 4 = -6 - 4 = -10

Find the value of f(-2).
HINT: Plug in -2 for x

f(x) = 10 - 2x

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Answer explanation

10 - 2(-2) = 10 + 4 = 14

Find the value of y when x = -2.

y= ( 3/2 ) x + 5

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Answer explanation

(3/2) (-2) + 5 = -3 + 5 = 2

The 2s in the fraction cancel!

Find f(-2).

f(x)=2(x-1)+4

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Answer explanation

2(-2 - 1) + 4 = 2(-3) + 4 = -6 + 4 = -2

The temperature, in degrees Fahrenheit, of a scientific sample being warmed steadily as a function of time in seconds after the sample is up in a machine, can be represented by the equation
f(x) = 2.1x + 86.

A graph of this equation goes through the point (60, 212). What does that mean?

• In 60 seconds, the temperature is 212 degrees.

• In 212 seconds, the temperature is 60 degrees.

• The temperature is 60 degrees.

• The time is 212 seconds.