During an experiment that Paul and Dawn performed the stretch of a spring was directly proportional to the force applied to the spring. When they put the data on a graph, they would expect to have what type of curve?

Question

During an experiment that Paul and Dawn performed the stretch of a spring was directly proportional to the force applied to the spring. When they put the data on a graph, they would expect to have what type of curve? 
Answers: Hyperbola, parabola, straight line, none of the above answers.

drwls · Answer

Proportionality of one variable with another, as in this case, indicates a linear relationship.