T.i.P.S.

Students should understand that graphing a proportional relationship will always have a yintercept through the origin (0, 0). Students should determine the slope from a proportional graph by finding the value of the ycoordinate when the xcoordinate is 1 and from a proportional table by finding the value of the output when the input is 1. Students should use either a table or graph to determine the slope of a line and the yintercept of the line.
Example

The graph of a linear function is shown on the coordinate grid.
Hint
Possible Solution
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TEKS

8.4 Proportionality. The student applies mathematical process standards to explain proportional and nonproportional relationships involving slope. The student is expected to:
(C) use data from a table or graph to determine the rate of change or slope and yintercept in mathematical and realworld problems