Michael J. answered • 11/28/15

Effective High School STEM Tutor & CUNY Math Peer Leader

The line has a positive slope. Therefore, as x increases from -∞ to ∞, the linear function increases.

Also, the interval is (-∞, ∞). We use parentheses rather than brackets. This is because infinity is not a defined number. It can be a very large number or a very small number that we do not know of exactly. The number increases or decreases continuously.

Michael J.

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