5y + 10x = 0
y = - 3x

Plz help me the photo is the directions for the problem

What is the smallest integer n such that n\sqrt{2} is greater than 20

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?

Asystem of equations has 1 solution.if 4x-y=5 is one of the equations , which could be the other equation ?