Discussion
Algebraic expression of difference of 13x and 7y can be written as
Answer: B
"Difference of 13x and 7y" means the first minus the second.
\[ 13x - 7y \]
The two terms are unlike, so the subtraction cannot be carried out any further - \( 6xy \) would come from subtracting the coefficients and merging the variables, which is not a valid step.
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