Henry bought a gallon of milk on monday. that day, he drank 2 cups of milk. on tuesday, he drank 1 cup of milk and his brother had 2 cups of milk. on wednesday, both henry and his brother had 2 cups of milk. how many cups of milk are left in the gallon?

Type the correct answer in the box. consider the system of linear equations below. rewrite one of the two equations above in the form ax + by = c, where a, b, and c are constants, so that the sum of the new equation and the unchanged equation from the original system results in an equation in one variable.