Try using conects. It takes the picture and gives you the best answer they can find. And it doesn’t change your answer to words
10 pairs of short cost 10s (without sale).
10% =0.1, and 10% off is
10s - 0.10*10s (B) = 10s -1s (D)
10s -1s = 9s (A)
Expression that does not match is (C),
correct answer is (C).
First add both number with x and then add both number with y and then add both numbers which is the answer to both equations and that is called linear combination.
I think 88/9 is a fraction if you looking for a mixed number it will be 9 7/9.