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Prove its a one-to-one function before doing inverse, Prerequisites for…

- - - - Vertical Line Test: determine whether or not is a function; only one y-value for each unique input x-value; intersect graph once vertically = a function
      - Horizontal Line Test: determines one-to-one function (cannot have two ordered pairs with same y-value); intersects graph once horizontally = one-to-one function
    - - of x1=x2 --> one-to-one