Ms. lounnivongsa is building a new deck on the back of her house, she wants 4\5 of it to be made from wood and the rest stone. how much of the deck will be made of stone? draw a model and explain

1/5 will be made from stone. 

Draw a square and then break it up into 5 parts. Shade one of those five parts to represent the part that is stone

1/5. 
Think of fractions as subtraction. So for this you do 5-4.
5 - 4 = 1.
So just add 5 under 1.
1/5 will be stone. :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.