Question

which graph is not proportional? the pink graph the black graph both neither

Explanation:

Step1: Recall proportional graph rule

A proportional graph (representing a direct proportion \( y = kx \)) must pass through the origin \((0,0)\) and be a straight line.

Step2: Analyze pink graph

The pink graph starts at \((0,0)\), so it could be proportional.

Step3: Analyze black graph

The black graph starts at \((0, 2)\) (not the origin), so it does not represent a proportional relationship.

Answer:

The black graph