Joy is preparing 15 liters of a 20% saline solution. she only has 30% and 10% solution in her lab. how many liters of the 30% and how many liters of the 10% should she mix to make the 20% solution?

If you mix 1 liter of the 10% solution with 1 liter of the 30% solution, you will have 2 liters of 20% solution. Keeping that in mind, you must mix half of the number of liters with 10%, and the other half with 30% in order to get 20%. So knowing all those things, we can do the problem. She needs 15 liters of 20%, so you need to mix 7.5 liters of 10% with 7.5 liters of 30%. After mixing those, you'll have 15 liters of 20% solution. I hope this helps. Please put as brainliest.

There is no graph but what i can say is that 1 is the slope and that -2 is the y- intercept