Question

3- Resolva as seguintes equações de 1º grau; a)21x – 17 = 109 b) 4x – 5 = 3x c) 90 – 5x – 30 = 50 d) – 30 + 5x +5 = 2x – 34 e) 10 (x +1) – 5 (x – 2) = 703- Resolva as seguintes equações de 1º grau;

a)21x – 17 = 109
b) 4x – 5 = 3x
c) 90 – 5x – 30 = 50
d) – 30 + 5x +5 = 2x – 34
e) 10 (x +1) – 5 (x – 2) = 70

Answer 1

Resposta:

a)21x – 17 = 109

21x=109+17

21x=126

X=126/21

X=6

b) 4x – 5 = 3x

4x-3x=5

X=5

c) 90 – 5x – 30 = 50

-5x=50-90+30

-5x=-10

X=-10/-5 (-1)

X=2

d) – 30 + 5x +5 = 2x – 34

5x-2x=-34+30-5

3x=-9

X=-9/3

X <-3

e) 10 (x +1) – 5 (x – 2) = 7

10x+10-5x+10=7

5x=7-10

5X=-3

X=-3/5