The scatter plot shows the length of a spring when a stretch force is applied. The equation represents the linear model for this data.

y = 0.73x + 1

What does the number 1 in the equation mean in this context?

The spring has a length of 1 inch when no force is applied.

The spring will stretch 1 inch for every pound of force applied.

The spring has no stretch when a force of 1 pound is applied.

The spring stretches a distance of 1 inch when a force of 0.73 pound is applied.