Question

7) Marque x na alternativa que representa uma equação do 1° grau:
a) 4x =7x - 30
b) 3x°- 5 = 5x + 7
c) yØ+ 2y - 5y = - 7y
d) Ox + 4 = x + 1
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Answer 1

Resposta:

a)9x-2= 4x+18

9x-4x=18+2

5x=20

x= 20/5

x=4

b) 2x-10+7x+10=180

9x=180

x=180/9

x=20

c) 7y-10= y+50

7y-y=50+10

6y= 60

y= 60/6

y=10

d)4x-18+3x=10

3x+4x=10+18

7x=28

x=28/7

x=4

e) 2x+5+x+7=18

2x+x= 18-5-7

3x= 6

x=6/3

x=2

f)5x-91=4x-77

5x-4x=-77+91

x= 14

g)7x+1=5x-7

7x-5x=-7-1

2x= -8

x=-8/2

x= -4

h) 4x+5=x+20

4x-x= 20-5

3x= 15

x=15/3

x=5