Question

Resolva as equações ( 1° grau )

2x + 4x - 6 = - 6 (x-1)

a+2a = -3a + 18

2 (x+3) = 4 ( x -1 )

18 + 5x = 28

5y - 6 = 2 (y+9)

Answer 1

a) 2x+4x-6= -6(x-1)

6x-6= -6x+6

6x+6x =6+6

12x=12

x=12:12

x=1

b)a+2a=-3a+18

a+2a+3a=18

6a=18

a=18:6

a=3

c) 2(x+3)=4(x-1)

2x+6=4x-4

2x-4x=-4-6

-2x=-10

x=-10:(-2)

x=5

d)18+5x=28

5x=28-18

5x=10

x-10:5

x=2

e) 5y-6=2(y+9)

5y-6=2y+18

5y-2y=18+6

3y=24

y=24:3

y=8