Question

.Resolva as equações, sendo U = Q (separe as respostas por vírgulas). A) 3y - 2 = - y + 4 B) 5 - 4x = x + 3 + 2x C) - 12 - 9x = - 4 - 12x D) - x - 6 + 3x = -2x + 8x + 15

Answer 1

`(A) y=1.5`

`(B)x=\frac27`

`(C)x=2\frac23`

`(D)x=-5.25`

Explanation:

(A)

`3y - 2 = - y + 4\\3y+y=4+2\\4y=6\\y=\frac64\\\\y=1.5`

(B)

`5 - 4x = x + 3 + 2x\\5 - 4x = 3 +3x\\5-3=3x+4x\\7x=2\\x=\frac27`

(C)

`-12 - 9x = - 4 - 12x\\-9x+12x=-4+12\\3x=8\\x=\frac83\\\\x=2\frac23`

(D)
`- x - 6 + 3x = -2x + 8x + 15`

`2x-6 = 6x + 15\\2x-6x=15+6\\-4x=21\\x=(21)/(-4) \\\\x=-5.25`