Question

1)Resolva as seguintes equações:
a)3x − 18 = −12 e)2(x + 3) = 20
b)10 + 4x = −8 + 2x f)−8(x + 1) = −16
c)4x = 36 − 2x g)8a − 3 = 5a + 6
d)2y − 11 = 10 − y h)5(2x − 1) = 3(x − 4)

Answer 1

Resposta:

a)3x − 18 = −12

3x= 18-12

3x=6 =>  x=6/3

x=2

b)10 + 4x = −8 + 2x => 4x-2x= -8-10

2x= -18 + x= -18/2

x= -9

c)4x = 36 − 2x =>  4x +2x= 36  => 6x=36  => x=36/6  => x=6

d)2y − 11 = 10 − y =>  2y + y =10+11 =>  3y= 21  => y= 21/3  => y=7

e)2(x + 3) = 20  => 2x+ 6 = 20  => 2x= 20-6  => 2x= 14  => x= 14/2  => x=7

f)−8(x + 1) = −16 => -8x -8 = -16  => -8x= -16 +8  => -8x=-8 (-1) => x=8/8  => x=1

g)8a − 3 = 5a + 6 =>  8a- 5a= +6+3  => 3a= 9  => a= 9/3 => a= 3

h)5(2x − 1) = 3(x − 4)  => 10x -5 = 3x -12  => 10x - 3x= -12+5  => 7x= -7  => x=-7/7

x= -1

Explicação passo a passo: Bons estudos.