Bryce prepared 6 kilograms of dough after working 2 hours. how much dough did bryce prepare if he worked for 5 hours? solve using unit rates.

6kilograms in 2 hours
6kg/2hrs=3kg per hour

So if he can prepare 3kg of dough an hour, in 5 hours he can prepare (3*5=15) 15kg of dough

Answer=15kg

4should be the last one n=4

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.