Question

1)resolva as equações a)0,3b+2=-10

Answer 1

a)3x+3=78
3x=78-3
3x=75
X=75/3 = 25

b) 4 (x-2)=4+2 (x-1)
4x-8= 4+2x-2
4x-2x= 4-2+8
2x= 10
X=10/2 = 5

c)2a+15=77
2a=77-15
2a= 62
a= 62/2 = 31

d) 5a-1=4 (a-2)
5a-1=4a-8
5a-4a= -8+1
a= -7

e) 12x+3(x-6)=8x-24
12x+3x-18=8x-24
15x-8x=-24+18
7x=-6
X=-6/7
X= 0,857...

f) 0,3Lr +2=-10
0,3Lr= -10-2
0,3Lr=-12
Lr= -12/0,3
Lr= -40

g) nn entendi se é -9, 9 ou 19

h) 4 (m+2) -5 (m+1)= 14-2(m-2)
4m+8-5m-5=14-2m+4
4m-5m+2m=14+4-8+5
m= 15

i) 50+n=22+3n
50-22=3n-n
28=2n
n=28/2
n= 14