Question

Ali simplifies the expression 9y+y9y+y to 9y29y2. Use the drop-down menus to complete the statements below to explain why Ali's solution is correct or incorrect.

Answer 1

I say she is incorrect because the equation 9y+y9y+y should equal 19y if I am correct.  I am sorry if im not correct but i believe she is incorrect 

Answer 2

Answer with explanation:

The expression is: 9 y + y 9 y + y

Ali Simplifies it  $=9y^2 9y^2$

→→Incorrect simplification done by Ali.

Solution of the expression:

 $9 y + y 9 y + y\\\\ \text{Adding the like terms}\\\\=9 y + y+ y 9 y\\\\= 10 y + 9 y y\rightarrow{\text{used commutative property}}\\\\AB=BA\\\\= 10 y + 9y^2$

→→Correct Simplification of the expression