Answer:
A, C, D
Step-by-step explanation:
Since 15 is a positive integer, it can be represented in positive situations.
15 students add classes to schedule. = 15
15 points are taken away. = -15
15 point are given. = 15
15 dollars has been added to your salary = 15
15 dollars have been taken from your salary = -15

Move variables to the left by adding their opposites to both sides. Eliminate the opposites.

Move constants to the right by adding their opposites to both sides. Eliminate the opposites.

Collect the like terms by subtracting their coefficients and numbers.

Calculate the sum or difference. Extract the negative sign from the expression. Add the numbers.

Divide both sides of the equation by 5 and calculate the quotient.
3x + 2y = 10 .....multiply by -2
2x + 3y = 15/2...multiply by 3
------------------
-6x - 4y = -20 (result of multiplying by -2)
6x + 9y = 22.5 (result of multiplying by 3)
-----------------add
5y = 2.5
y = 2.5/5
y = 1/2
3x + 2y = 10
3x + 2(1/2) = 10
3x + 1 = 10
3x = 10 - 1
3x = 9
x = 9/3
x = 3
solution is (3,-1/2)
Really night what's the problem