Question

Equações simples. Quero saber como se resolve, e as respostas.
a) 3x-9 = 6x+8
b) 4t-9 = 2t-7+8
c) 2m-5 = 7m+12-4
d) 3d+9-4 = 7d-2+4d
e)7a-5 = 2a+7-4a
f) 4n-12 = -9+8-15n
g) 8p-2 = -6p-14

Answer 1

a)3x-6x=8+9    -3x=17(-1)     3x=-17    x=-17/3

b)4t-2t=1+9      2t=10     t=10/2    t=5

c)2m-7m=8+5      -5m=13(-1)    5m=-13    m=-13/5

d)3d+5=11d-2      3d-11d=-2-5     -8d=-7(-1)     d=7/8

e)7a-5=-2a+7     7a+2a=7+5      9a=12     a=12/9      a=4/3

f)4n+15n=-1+12     19n=11      n=11/19

g)8p+6p=-14+2     14p=-12    p=-12/14     p=-6/7

Answer 2

Olá,

Vamos lá,

a) 3x-9 = 6x+8
3x - 6x = 8 +9
-3x = 17
x = -17/3

b) 4t-9 = 2t-7+8
4t - 2t = -7+8+9
2t = 10
t= 5

c) 2m-5 = 7m+12-4
2m - 7m = 12 - 4 + 5
-5m = 13
m = -13/5

d) 3d+9-4 = 7d-2+4d
3d -7d - 4d = -2 +4 -9
-8d = -7
d = 7/8

e)7a-5 = 2a+7-4a
7a -2a+4a=7+5
9a = 12
a = 12/9 = 4/3

f) 4n-12 = -9+8-15n
4n +15n= -9 +8 +12
19n = 11
n = 11/19

g) 8p-2 = -6p-14
8p + 6p = -14+2
14p = -12
p = -12/14 = -6/7