To make y the subject, we must move everything to one side and y on the other.

Good day and I hoped that helped!
The multiplication sign because "6 teaspoons of flour per pancake (6x) 10 pancakes she want to make (6x10=60) 60 tablespoons of flour!
One is 7 and the other is 8 because 7 squared is 49 and 8 squared is 64.