Question

resolva as equações do 1 grau

(g) 2x+1=4x-7

(h) 9x+9+3x=15

(i) 16x-1=12x+3

(j) 3x-2=4x+9

(k) 5x-3+ x+2x+9

(L) 17x-7x=x+18

Answer 1

Vamos lá

resolva as equações do 1 grau

(g) 2x+1=4x-7

(h) 9x+9+3x=15

12x = 15 - 9

12x = 6

x = 6/12 = 1/2

(i) 16x-1=12x+3

16x - 12x = 3 + 1

4x = 4

x = 1

(j) 3x-2=4x+9

4x - 3x = -2 - 9

x = -11

(k) 5x-3+ x+2x+9

5x - 3 = 3x + 9

2x = 12

x = 6

(L) 17x-7x=x+18

10x - x = 18

9x = 18

x = 2

Answer 2

Oi

g)

2x + 1 = 4x - 7

2x - 4x = - 7 - 1

- 2x = - 8 (× por -1)

2x = 8

x = 8/2

x = 4

h)

9x + 9 + 3x = 15

12x = 15 - 9

12x = 6

x = 6/12

x = 1/2

i)

16x - 1 = 12x + 3

16x - 12 = 3 + 1

4x = 4

x = 4/4

x = 1

j)

3x - 2 = 4x + 9

3x - 4x = 9 + 2

- x = 11 ⇒(× por -1)

x = - 11

k)

5x - 3 + x + 2x + 9

8x + 6

l) 17x - 7x = x + 18

17x - 7x - x = 18

9x = 18

x = 18/9

x = 2

Bons estudos.