Question

Each notebook in a store costs $7

Answer 1

7x + 2y = 27

I can't read what the variables are in the picture, so I used x and y. But replace the variable 'x' with whatever the question says to use for notebooks, and change y to be whatever it says for the second thing in the store.

What my equation means is that an unknown number of notebooks, which is 7$ each, plus the other thing, which is $2 each, comes to a sum of $27.