Representing Linear Proportional Situations

T.i.P.S.

Students should use their prior knowledge from seventh grade concerning the constant of proportionality to understand the relationship between proportional situations in a variety of forms. A proportional relationship can be represented by the equation y = kx where k is the constant rate of change, unit rate, or slope.

Example

The cost of bananas per pound is represented in the table below. 

 Write an equation that represents the cost of buying x amount of bananas. Justify your thinking.
Hint
Possible Solution

TEKS

Supporting Standard 8.5 Proportionality. The student applies mathematical process standards to use proportional and non-proportional relationships to develop foundational concepts of functions. The student is expected to:

(A) represent linear proportional situations with tables, graphs, and equations in the form of y = kx 

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