Khan Academy

Supporting grades: 7

Description: Sal compares constants of proportionality in various forms, such as graphs, equations, contexts, diagrams, and tables. Now, let's see, car B travels the distance of D kilometers in H hours based on the equation 55h is equal to D. Alright, now, let's see if we can translate this somehow into kilometers per hour. And so, another way to think about it is distance divided by time, so if we divide both sides by hours, we would have distance divided by time, and so if we have D over H, then we would just be left with 55 on the right hand side. Now, car C travels 135 kilometers in three hours.

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