Question

(4,5 y +9)-(6,2-3,1y) = 7,2y-2,8​

Answer 1

$(4.5y + 9) - (6.2 - 3.1y) = 7.2y - 2.8 \\ 4.5y + 9 - 6.2 + 3.1y = 7.2y - 2.8 \\ 7.6y + 2.8 = 7.2y - 2.8 \\ 7.6y - 7.2y = - 2.8 - 2.8 \\ 0.4y = - 5.6 \\ y = - 5.6 \div 0.4 \\ y = - 14$

Answer 2

To solve the given expression, let's perform the subtraction:

(4,5y + 9) - (6,2 - 3,1y)

Distribute the negative sign to each term inside the second parentheses:

4,5y + 9 - 6,2 + 3,1y

Combine like terms:

(4,5y + 3,1y) + (9 - 6,2)

7,6y + 2,8

Therefore, the expression (4,5y + 9) - (6,2 - 3,1y) simplifies to 7,6y + 2,8.