Question

1_ Resolva as seguintes equações:
a) x − 8 = −10 b) x + 9 = −1 c) 5x = 80 d) 35x = −105

e) 7x − 1 = 13 f) 6x − 10 = 2x + 14 g) 6x = 2x + 28 h) 3(x + 2) = 15

i) 2(x − 1) − 7 = 16 j) 7(x − 2) = 5(x + 3) k) 2(x − 6) = −3(5 + x)

Answer 1

Resposta:

a -2; b -10; c 16; d -3; e 2; f 6; g 7; h 3; i 12,5; j 82; k -0,6

Explicação passo-a-passo:

a) x-8=-10

x=-10+8

x=-2

b) x+9=-1

x=-1-9

x=-10

c) 5x=80

x=80/5

x=16

d) 35x=-105

x=-105/35

x=-3

e) 7x-1=13

7x=13+1

7x=14

x=14/7

x=2

f) 6x-10=2x+14

6x-2x=14+10

4x=24

x=24/4

x=6

g) 6x=2x+28

6x-2x=28

4x=28

x=28/4

x=7

h) 3(x+2)=15

3x+6=15

3x=15-6

3x=9

x=9/3

x=3

i) 2(x-1)-7=16

2x-2-7=16

2x-9=16

2x=16+9

2x=25

x=25/2

x=12,5

j) 7(x-2)=5(x+30)

7x-14=5x+150

7x-5x=150+14

2x=164

x=164/2

x=82

k) 2(x-6)=-3(5+x)

2x-12=-15-3x

2x+3x=-15+12

5x=-3

x=-3/5

x=-0,6