how do you find the missing number/what is the missing number?

Solving a Single Variable Equation :

Solve  :    3x+1 = 0

Subtract  1  from both sides of the equation :

                3x = -1

Divide both sides of the equation by 3:

         x = -1/3 = -0.333

One solution was found :

         x = -1/3 = -0.333

mr. flanders’ class sold 47 doughnuts and   mr. rodriquez’s class sold 38 cartons of milk

step-by-step explanation:

let x be the number of doughnuts sold by mr. flanders’ class and y be the number of cartons sold by mr. rodriquez’s class.

1. together, the classes sold 85 items, then

x+y=85.

2. both classes earn earned $104.49 for their school. if doughnuts were sold for $1.35 each, then x doughnuts costed $1.35x. if cartons of milk were sold for $1.08 each, then y cartons costed $1.08y. hence,

1.35x+1.08y=104.49.

3. solve the system of two equations:

1.0

step-by-step explanation: