Isla estimates that her dinner has 48 grams of fat in it. What percentage of her total daily allowance of fat does her meal
contain?
(Round your answer to a whole number)
%
Here is a guideline of the recommended daily allowances.
Typical Values
Women
Men
Protein
45 g
559
Carbohydrate
230 g
300 g
Sugars
90 g
120 g
Fat
709
959
Fibre
24g
249

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.