What term describes the relationship between two variables that graph as a straight line with a positive slope?

The term that describes the relationship between two variables that graph as a straight line with a positive slope is "directly proportional." When two variables are directly proportional, it means that as one variable increases, the other variable also increases at a constant rate. This linear relationship is characterized by a straight line when plotted on a graph, where the slope of the line represents the constant of proportionality.

In a directly proportional relationship, the ratio of the two variables remains constant, which is why any increase in one variable results in a corresponding increase in the other, maintaining the straight line graph with a positive slope. This concept is fundamental in physics, allowing for the clear representation of relationships between quantities, such as distance and time in uniform motion.