Determine the rate of change from the graph. The rate of change shown in the graph is
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Step-by-step explanation:

Graph A:

This graph passes through the points (1,220) and (7,40). Determine the rate of change:

This rate of change is negative. The meaning of this rate of change is

Each second the elevation decreases by 30 feet.

This is not proportional relationship, because this graph does not pass through the origin.

Graph B:

This graph passes through the points (0,0) and (8,20). Determine the rate of change:

This rate of change is positive. The meaning of this rate of change is

Each loaf needs 2.5 cups of flour.

This is proportional relationship, because this graph passes through the origin and is a straight line.