Monday, 24 February 2014

Substitution: Can you tell What's Wrong? (2)


7 comments:

  1. In line 1, the both of the b's cannot be cancelled as we are subtracting one number from another (in this case, b/c from a/b). We can only cancel the two b's when we are dividing the number. Therefore, the steps from line 1 onward leading to the final answer is wrong.

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  2. Line 1 is wrong. It is incorrect to do cross multiplication, which is substituting the two b's with "1" as it is not multiplication, but division. Only in division, you can do cross multiplication

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  3. You cannot simplify and cancel both of the 'b's as that can only be done in multiplication.
    Line 1 is already wrong.

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  4. In line 1, cross multiplication can only be done with multiplication, and cannot be done with subtraction

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  5. Line 1 is wrong because you are not allowed to simplify and cancel both of the "b"'s as that can be only done in multiplication.

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