Question

1) Vamos resolver as equações a seguir:
a) 3x - 9= 9
b) 10x = 20 + 9x
c) 5x + 3x = 16
d) 5x - 8 = 3x + 6
e) 7x - 2 - 5x = 18
f) 4(x + 1) = 12
g) 5(x + 3) = 4(x - 2) + 6
h) 2(x + 3) = 30
1) 3(y - 1) - 4(y-2) = 6
D) 3(2x + 4) = 4(x + 6)
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Answer 1

Explicação passo-a-passo:

a) 3x - 9 = 9

3x= 9+9

3x= 18

x= 18/3 x=6

b) 10x = 20 + 9x

10x-9x= 20

x=20

c) 5x + 3x = 16

8x=16

x=16/8 x=2

d) 5x - 8 = 3x + 6

5x+3x = 6+8

8x = 14

x= 14/8 ÷2 x=7/4

e) 7x - 2 - 5x = 18

7x -5x = 18+2

2x=20

x=20/2 x=10

f) 4(x + 1) = 12

4x +1 = 12

4x = 12-1

4x= 11

x= 11/4

g) 5(x + 3) = 4(x - 2) + 6

5x +15 = 4x -8 +6

5x -4x = -8 +6 -15

x = -17

h) 2(x + 3) = 30

2x +6 = 30

2x = 30 -6

2x = 24

x= 24/2 x=12

1) 3(y - 1) - 4(y-2) = 6

3y -3 -4y +8 = 6

3y -4y = 6 +3 -8

-1y = 1 .(-1)

y= -1

D) 3(2x + 4) = 4(x + 6)

6x +12 = 4x +24

6x +4x = 24 -12

10x = 12

x=12/10

x= 6/5 ou x= 1.2