If x>7, then |x|>7. |y|>7, so y=7
Valid or invalid?
1 answer:
is a valid argument
is not a valid argument
For the first argument:
From the definition of absolute value function
if
That is every positive number is its own absolute value. Since
,
we can argue that
so the first argument is valid
For the second argument:
From the definition of absolute value function
This means that
or
no part of the definition allow for the option . So the second argument is not valid.
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