Is either x = 9 or x = 15 a solution to x-3 = 12?

x = 15 is your solution.

Step-by-step explanation:

To find out what your answer is, plug in the given solutions for the variable, x, in the given equation:

When x = 9:

x - 3 = 12

(9) - 3 = 12

6 ≠ 12

When x = 15:

x - 3 = 12

(15) - 3 = 12

12 = 12

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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: