Question

sendo U=Q resolva as seguintes equações do 1 grau com uma incógnita

a)7x+1-5x=9

b)y+9y+5=-15

c)17x-1=15x+3

d)16-x=x+25

e)20x-13=20+9x

f)21x+1=11x+6

g)9x-23=13x-27

h)0,8+2x=x+3,5

i)3,5x+1=3,1x+3

j)5-x-22=4x-11-6x

Answer 1

Resposta A:
7x+1-5x=9
7x-5x=9-1
2x=8
x=8/2
x=4

Resposta B:
y+9y+5=-15
y+9y=-15-5
10y=-20
y=-20/10
y=-2

Resposta C:
17x-1=15x+3
17x-15x=3+1
2x=4
x=4/2
x=2

Resposta D:
16-x=x+25
-x-x=25-16
-2x=9 (×-1)
2x=-9
x=-9/2

Resposta E:
20x-13=20+9x
20x-9x=20+13
11x=33
x=33/11
x=3

Resposta F:
21x+1=11x+6
21x-11x=6-1
10x=5
x=5/10

Resposta G:
9x-23=13x-27
9x-13x=-27+23
-4x=-4 (×-1)
4x=4
x=4/4
x=1

Resposta H:
0,8+2x=x+3,5
2x-x=3,5-0,8
x=2,7

Resposta I:
3,5x+1=3,1x+3
3,5x-3,1x=3-1
0,4x=2
x=2/0,4
x=5

Resposta J:
5-x-22=4x-11-6x
-x-4x+6x=-11-5+22
x=6