0.7 Relations and linear models

Ideas in this lesson

Determine whether a relation is a function

Each input may be paired with only one output.

Direct variation

In a direct variation the ratio of output to nonzero input is constant.

Intercepts of a standard-form line

Set the other coordinate to zero to find an intercept.

Direct variation from a table

Check the output/input ratio at every listed nonzero input before predicting.

Compare rates across representations

Compute the table slope and compare it with the coefficient in the other function’s equation.