Question

1) Resolva as seguintes equações
a) x + 5 = 8
b) x - 4 = 3
c) x + 6 = 5
d) x -3 = - 7
e) x + 9 = -1
f) x + 28 = 11
g) x - 109 = 5
h) x - 39 = -79
i) 10 = x + 9

j) 15 = x + 20
l) 4 = x - 10
m) 7 = x + 8
n) 0 = x + 12
o) -3 = x + 10
l) 84 = 6x
m) x/3 =7
n) x/4 = -3
o) 2x/5 = 4
p) 2x/3 = -10
q) 3x/4 = 30
r) 2x/5 = -18

Answer 1

a) x + 5 = 8

x = 8 - 5

x = 3

b) x - 4 = 3

x = 3 + 4

x = 7

c) x + 6 = 5

x = 5 - 6

x = -1

d) x - 3 = -7

x = -7 + 3

x = -4

e) x + 9 = -1

x = -1 - 9

x = -10

f) x + 28 = 11

x = 11 - 28

x = -17

g) x - 109 = 5

x = 5 + 109

x = 114

h) x - 39 = -79

x = -79 + 29

x = -40

i) 10 = x + 9

10 - 9 = x

x = 1

j) 15 = x + 20

15 - 20 = x

x = -5

l) 4 = x - 10

x = 4 + 10

x = 14

m) 7 = x + 8

x = 7 - 8

x = -1

n) 0 = x + 12

x = 0 - 12

x = -12

o) -3 = x + 10

x = -3 - 10

x = -13

l) 84 = 6x

x = 84/6

x = 14

m) x/3 =7

x = 7 . 3

x = 21

n) x/4 = -3

x = -3 . 4

x = -12

o) 2x/5 = 4

x = 5 . 4/2

x = 10

p) 2x/3 = -10

x = -10 . 3 / 2

x = -15

q) 3x/4 = 30

x = 4 . 30 / 3

x = 40

r) 2x/5 = -18

x - -18 . 5/9

x = -10