Susie is telling Tim about linear functions. Check all choices that accurately finish her sentence.

Question

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"In order to be a linear function, a graph must..."

... be a curve.

... be a line.

... have positive slope.

... have negative slope.

... have inputs and outputs.

... pass the vertical line test.

Answer 1

To accurately finish Susie's sentence about linear functions, the following choices should be checked:

• ... be a line.
• ... have inputs and outputs.
• ... pass the vertical line test.

The other choices are not correct because a linear function cannot be a curve, and it can have either a positive or negative slope (or even a slope of zero, which is a horizontal line).