When x / k = y, X is proportional to y; when K / x = y, X is proportional to y; when kxy = 2, X is proportional to y; when K / x = 1 / y, X is proportional to y?

When x / k = y, X and y are in (positive) proportion; when K / x = y, X and y are in (inverse) proportion; when kxy = 2, X and y are in (inverse) proportion; when K / x = 1 / y, X and y are in (positive) proportion
Learning from the sea

1. Factorization
The square of x-y-2y-1
2. It is known that the power of 9 is n + 1, and the power of 3 is 2n = 648
3. Given 2x + y = 1, find the value of the square of the algebraic formula (y + 1) - (the square of y-4x + 4)

1. X & # 178; - Y & # 178; - 2y-1 = x & # 178; - (Y & # 178; + 2Y + 1) = x & # 178; - (y + 1) & # 178; = (x + y + 1) (x + Y-1) 2, 2n power of N + 1 power-3 of 9 = n power of 6489 × n power of 9-9 = n power of 6489 × n power of 8 = n power of 6489 = 81  9 & # 178; = 81  n = 23, (y + 1) & # 178; -

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When x / k = y, X is proportional to y; when K / x = y, X is proportional to y; when kxy = 2, X is proportional to y; when K / x = 1 / y, X is proportional to y?