Question

16 Resolva as sentenças abaixo.

a) x + 2 = 6
b)x - 4= -1
c) 2.8+4= 12
d) 3.X-5 = x + 19​

Answer 1

Resposta:

$x + 2 = 6\\x + 2-2 = 6-2\\\\x + 2-2 = 6-2\\x= 6-2\\\\x= 6-2\\x= 4\\6-2= 4\\\\x= 4\\\\x - 4= -1\\x - 4 + 4= -1 + 4\\\\x - 4 + 4= -1 + 4\\x = -1 + 4\\\\x = -1 + 4\\x = 3\\4-1= 3\\\\x = 3\\\\2 . 8 + 4= 12\\16 + 4 = 12\\\\16 + 4= 12\\20= 12\\\\3.x -5 = x -19\\3.x -5 + 5= x - 19 + 5\\3x = x -19 + 5\\3x = x -14\\3x -x= x -14-x\\2x = x -14 -x\\2x = -14\\2x/2 = -14/2\\x = -14/2\\x = -14\\14 : 2= 7 - + = -7\\\\x= -7$