Graph the line that represents a proportional relationship between $d$ and $t$ with the property that an increase of $0.2$ units in $t$ corresponds to an increase of $1.8$ units in $d$. **What is the unit rate of change of $d$ with respect to $t$? ** (That is, a change of $1$ unit in $t$ will correspond to a change of how many units in $d?$) The unit rate of change is [[☃ math-keypad 1]] . **Graph the line. ** [[☃ interactive-graph 1]]