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Linear equations word problems: graphs


Archimedes drained the water in his tub.
The amount of water left in the tub (in liters) as a function of time (in minutes) is graphed.
A first quadrant coordinate plane. The horizontal axis is from zero to five point five with a scale of one-halve and is titled Time in minutes. The vertical axis is from zero to four hundred with a scale of forty and is titled Water in liters. The graph of the line is y equals negative seventy-two x plus three hundred sixty.
How much water was initially in the tub?
  • Your answer should be
  • an integer, like 6
  • a simplified proper fraction, like 3/5
  • a simplified improper fraction, like 7/4
  • a mixed number, like 1 3/4
  • an exact decimal, like 0.75
  • a multiple of pi, like 12 pi or 2/3 pi