Question

Eva starts her exercise routine by walking for 5 minutes. The equation that models the total amount of time Eva spends exercising, t after running for r minutes is $t=r+5.$

Which of the following graphs model the given relation?

• A.
• B.

Answer 1

The correct option is A

Duration of exercise routine = t min
Duration of run = r min
The equation is t = r + 5.

$\begin{array}{ccccc}r& 0& 5& 10& 15\\ t& 0+5=5& 5+5=10& 10+5=15& 15+5=20\end{array}$

Let’s plot these points on the graph.

Hence, option b is correct.