Question

ressolva as equações a seguir:
a)x+2=2x-4
b)2x+1-x=2x+x+4
c)2y-17=y
d)42(x-3)=126
e)2(x+3)=2(3+x)-x+10

Answer 1

Vamos com calma.

Letra A

$x+2=2x-4\\\\x-2x=-4-2\\\\-x= -6.(-1)\\\\x= 6$         Resposta: X = 6

Letra B

$2x+1-x=2x+x+4\\\\2x-x-2x-x= 4-1\\\\-2x= 3.(-1)\\\\2x=-3\\\\x= \frac{-3}{2}$Resposta: X=  -3/2  ou -1,5

Letra C

$2y-17=y\\\\2y-y=17\\\\y= 17$                 Resposta: Y= 17

Letra D

$42(x-3)=126\\\\42x-126= 126\\\\42x= 126+126\\\\42x= 252\\\\x= \frac{252}{42} \\\\x= 6$             Resposta: X = 6

Letra E

$2(x+3)= 2.(3+x)-x+10\\\\2x+6= 6+2x-x+10\\\\2x-2x+x= 6+10-6\\\\x= 10$    Resposta: X = 10