27
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9
Infinite.
What is x in 3x-9 EQUALS 27? X= 36 THIS IS THE WORK: 27 + 9= 36 36/3= 12 :)
y = 3x + y => x = 0then y = x - 9 => y = 0 - 9 = -9.
The number of combinations of the letters TELEPHONE is 9 factorial, or 362,880. From that, however, we have to divide by 4 to account for the E being repeated twice, so the number of distinct combinations is 90,720.