Mirandah simplified the expression 5 x + 9 y - 4 . She says the answer is 10 x y . Answer the following questions. What error did Miranda make while combining like terms? What should her answer be?

5x + 9y -4

Step-by-step explanation:

The expression is already in simplified form, however, Miranda made the mistake of adding the coefficients of 5 and 9 and subtracting the constant of -4 which equals to 10, furthermore, she added the variables x and y, which are not considered like terms. resulting in the wrong solution.