[理工] [離散]函數
For each of the following fuction f:R->R,determin whether f is invertible,
and if so ,determin f^-1
a. f={(x,y)|2x+3y=7}
ans:
f^-1={(y,x)|2x+3y=7}={(x,y)|3x+2y=7}
請問一下,f^-1這答案怎麼來的呢?謝謝。
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