Y - 2x = 8 . . . . (1)
16 + 4x = 2y . . (2)
From (1), y = 2x + 8 . . . (3)
Putting (3) into (2) gives
16 + 4x = 2(2x + 8) = 4x + 16
0 = 0
Therefore, there are infinite number of solutions.
the main equation you need to do is just 36 x (3/4), you will get that 27 dollars has been spent.
now you just do 36 - 27 to get the final answer
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