There are 15 plates in a kitchen cabinet. The diameter of each plate is either 7 inches or 12 inches. The diameter of all 15 plates combined is 140 inches.
Which system of equations can be used to find the number of 7-inch plates, x , and the number of 12-inch plates, y , that are in the cabinet?
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Answer:
7x + 2y = 140
can be solved using graphical method
since there is only one eqn and two variables, there will be infinitely many solutions
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