Question

Resolva as equações do 1º grau

a)18x - 43 = 65
b) 23x - 16 = 14 - 17x
c) 10y - 5 (1 + y) = 3 (2y - 2) - 20
d) 3y - 10 + 13= - 2y + 28
e) -5x+45-89= - 90 + 41

Answer 1

Resposta:

a)18x-43=65

18x=65+43

18x=108

x=108÷18

x=6

b)23x-16=14-17x

23x+17x=14+16

40x=30

x=30÷40

x=0,75

c)10y-5(1+y)=3(2y-2)-20

10y-5-5y=6y-6-20

10y-5y-6y=-6-20+5

-1y=-21

y=-21×(-1)

y=21

d)3y-10+13=-2y+28

3y+2y=+28+10-13

5y=25

y=25÷5

y=5

e)-5x+45-89=-90+41

-5x=-90+41-45+89

-5x=-5

x=-5×(-5)

x=25