Question

resolva as equações:


a) -2.(x-3) = 18

b) y+4 = -15

c) 3x+9 = 12

d) 10-4x = 9+2x

e) a-3a+5a = 12

f) 3.(x-1) = 6

g) 2.(x+5) =-4

Answer 1

a) -x + 6 = 18

-x = 18 - 6

-x = 12 (-1)

x = - 12

b) y = - 15 + 4

y = - 11

c) 3x = 12 - 9

3x = 3

x = 3/3

x = 1

d) -4x - 2x = 9 -10

-6x = -1 (-1)

6x = 1

x = 1/6

e) -2a + 5a = 12

3a = 12

a = 12/3

a = 4

f) 3x - 3 = 6

3x = 6 - 3

3x = 3

x = 3/3

x = 1

g) 2x + 10 = - 4

2x = - 4 - 10

2x = - 14

x = - 14/2

x = - 7