Find two numbers whose difference is 12 and whose sum is 40

Use the elimination method to find the solution to the system of equations. 2x - 3y = -9 -x + 3y = 6

Amuffin recipe, which yields 12 muffins, calls for cup of milk for every 1 cups of flour. the same recipe calls for cup of coconut for every cup of chopped apple. to yield a batch of 30 muffins, how much flour will be needed in the mix?

What is a graph with a never ending line called?