Question

Gente me ajudem nessas questoes

a)2×+3=15
b)7×-1=13
c)2×-4=3
d)4×+2=-18
e)5×-2=7+6
f)10×+1=-4-5

Answer 1

Gente me ajudem nessas questoesBASTA isolar o (x)) e atenção no SINAL


a)2×+3=15

2x + 3 = 15
2x = 15 - 3
2x = 12
x = 12/2
x = 6



b)7×-1=13

7x - 1 = 13
7x = 13 + 1
7x = 14 
x = 14/7
x = 2



c)2×-4=3

2x  - 4 = 3
2x = 3 + 4
2x = 7
x = 7/2

d)4×+2=-18

4x + 2 = - 18
4x = - 18 - 2
4x = - 20
x = - 20/4
x = - 5

e)5×-2=7+6

5x - 2 = 13
5x = 13 + 2
5x = 15
x = 15/5
x = 3


f)10×+1=-4-5

10x + 1 = - 4 - 5
10x + 1 = - 9
10x = - 9 - 1
10x = - 10
x = - 10/10
x = - 1
 

Answer 2

a) 2x+3=15 
2x=15-3
2x=12
x=12/2
x=6

b) 7x-1=13
7x=13+1
7x=14
x=14/7
x=2

c)2x-4=3
2x=3+4
2x=7
x=7/2
x=3,5

d) 4x+2=-18
4x=-18+2
4x=-16
x=-16/4
x=-4

e)5x-2=7+6
5x-2=13
5x=13+2
5x=15
x=15/5
x=3

f)10x+1=-4-5
10x+1=-9
10x=-9+1
10x=-8
x=-8/10