Question: Explain how to write and solve the equation to solve the problem.

Bella saved enough money to buy 3 books. If each book cost $13, how much money did Bella

she saved 39 dollars because, one book is 13 dollars she wanted 3 of them. so the equation would be 13 x 3 =39, so in the end she saved 39 dollars to buy those three books

Bis your answer rot d

So the first thing we do is to multiply the top equation by 3. the reason i want to do this is i notice there will be a 6y on both equations and can possibly add/subtract them. so we get 6y = -3x + 27. adding that and the second equation we get 6x = 27-15 which is 12. divide by 6 and we get 2. ∴ x = 2. substituting 2 into the first equation we get 2y = -2 + 9 which is 7. divide by 2 and we get 7/2. ∴ y = 7/2, x = 2.

It will never be positive always negative