
Learning Mathematics
A straight-line graph is not always a proportional relationship
A proportional relationship has a constant ratio and a graph through the origin. Compare two simple pricing examples to see why a straight line is not enough.

A proportional relationship has a constant ratio and a graph through the origin. Compare two simple pricing examples to see why a straight line is not enough.

Build a ratio table from repeated groups, keeping both quantities in proportion instead of adding the same number to each side.