Question

4-Resolva as equações: a) 8b - 3 = 5b +6 b) 2y + 9 = 10-y e) 2x + 3x + 9 = 8( 6 - x) g) 3(2x + 3) - 4(x-1) = 3

PFVR!!!!​

Answer 1

Resposta:

a) 8b - 3 = 5b +6

$8b - 3 - 5b - 6 = 0 \\ 3b - 9 = 0 \\ 3b = 9 \div (3) \\ b = 3$

b) 2y + 9 = 10-y

$2y + 9 - 10 + y = 0 \\ 3y - 1 = 0 \\ 3y = 1 \\ \\ y = \frac{1}{3}$

e) 2x + 3x + 9 = 8( 6 - x)

$5x + 9 = 48 - 8x \\ 5x + 9 - 48 + 8x = 0 \\ 13x - 39 = 0 \\ 13x = 39 \div (13) \\ x = 3$

g) 3(2x + 3) - 4(x-1) = 3

$6x + 9 - 4x + 4 = 3 \\ 2x + 13 - 3 = 0 \\ 2x + 10 = 0 \\ 2x = - 10 \div (2) \\ x = - 5$