at a fast food restaurants 4 cheeseburgers and 5 small fries have a total of 2310 calories. 3 cheeseburgers and 2 small fries have a total of 1330 calories. how many calories does each item contain?
In order to do the substitution, you need to get one equation to have a positive number and one to have a negative of the same number with the same variable. In this case, we need to multiply the first equation by 3 and the second by -4.
Then add the equations together. The 12x and -12x will cancel each other out and you solve for y.
