Explanation:
Part A:
The graph of the equation y = -3x + 7 intersects the y-axis at the point (0, 7) and the x-axis at the point (7/3, 0).
Part B:
At 0 minutes, the tub has 7 gallons of water. This is represented by the point (0, 7) on the graph.
The tub is empty when y = 0, which corresponds to -3x + 7 = 0. Solving for x:
-3x = -7
x = 7/3
So, the tub is empty at approximately 2.33 minutes, which is represented by the point (7/3, 0) on the graph
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