Identifying a Graph of a Proportional Relationship Which graph represents a proportional relationship?
On a coordinate plane, a straight line with negative slope goes through points (2, 6), (4, 5).
On a coordinate plane, a curve opens down.
On a coordinate plane, a straight line with positive slope goes through points (5, 2) and (6, 3).
On a coordinate plane, a straight line with positive slope goes through points (3, 3) and (4, 4).