Question

a) 3×.2-5.1=10×-2.2
b) 7(y-1)=2 (3y+1)
c) y+4(y-1)=9-2(y+2)
d)4(y-2)+3 (2y-1)=6(2y-3)

alguém por favor ?​

Answer 1

a)

$3x \times 2 - 5 \times 1 = 10x - 2 \times 2 \\ 6x - 5 \times 1 = 10 - 2 \times 2 \\ 6x - 5 = 10x - 2 \times 2 \\ 6x - 5 = 10 \times - 4 \\ 6x - 10x - 5 = - 4 \\ 6x - 10x - 4 + 5 \\ - 4x = - 4 + 5 \\ - 4x = 1$

b)

$7(y - 1) = 2(3y + 1) \\ 7y - 7 = 2(3y + 1) \\ 7y - 7 = 6y + 2 \\ 7y + 6y = 2 + 7 \\ y = 2 + 7 \\ y = 9$

c)

$y + 4( y + 1) = 9 - 2(y + 2) \\ y + 4y + 4 = 9 - 2(y + 2) \\ y + 4y + 4 = 9 - 2y - 4 \\ 5y + 4 = 9 - 2y - 4 \\ 5y + 4 = 5 - 2y \\ 5y + 2y = 5 - 4 \\ 7y = 5 - 4 \\ 7y - 1$

d)

$4(y - 2) + 3(2y - 1) = 6(2y - 3) \\ 4y - 8 + 6y - 3 = 12y - 18 \\ 10y - 12y = - 18 + 11 \\ - 2y = - 7$