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Big Ideas Math Integrated I, 2016

BI

Big Ideas Math Integrated I, 2016 View details

3. Function Notation

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Exercise 19 Page 125

When we use function notation, we use f(x) instead of y.

5

Practice makes perfect

Usually, when we think about points on coordinate planes, we think of them as x-coordinates and y-coordinates. However, when we use function notation, we use f(x) instead of y.

( x, y) ⇔ ( x, f(x)) We want to know the value of x when f(x)=7. To do this, we need to find the corresponding x-value of the function when the y-value is 7.

We can see that the function crosses through the point (5,7). Therefore, when f(x)=7, x=5.

Subchapter links

Communicate Your Answer p.121

Monitoring Progress p.122-124

Exercises p.125-126