T.i.P.S.

Students should use their knowledge of proportional and nonproportional relationships to determine when functions are proportional or nonproportional. Proportional functions will be in the form y = kx and nonproportional functions will be in the form y = mx + b. Students should be determining if a function is proportional or nonproportional in a mathematical or realworld situation.
Example

The table below shows the relationship between the amounts of money in Sarah’s savings account and the number of months she has been saving money. Is this an example of a proportional relationship? Justify your thinking.
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TEKS

8.5 Proportionality. The student applies mathematical process standards to use proportional and nonproportional relationships to develop foundational concepts of functions. The student is expected to:
(H) identify examples of proportional and nonproportional functions that arise from mathematical and realworld problems