if 2 x + y = 6 and x + 2 y = 5 , then ( x + y ) / 3 =
we have two equations : 2 x + y = 6 x + 2 y = 5 notice that something nice happens when we add them . we get : 3 x + 3 y = 11 divide both sides by 3 to get : x + y = 11 / 3 so , ( x + y ) / 3 = 11 / 9 answer : d
divide(add(divide(subtract(multiply(6, 2), 5), subtract(multiply(2, 2), const_1)), subtract(6, multiply(2, divide(subtract(multiply(6, 2), 5), subtract(multiply(2, 2), const_1))))), 3)