Question

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Answer 1

Resposta:

I- (d)

(c)

(b)

(a)

II- a) 2; x

b) 3; y

c) 2; n

d) 2; k

III- a) 3x+2 = 8

3x = 8-2

3x = 6

x = 6÷3

x = 2

b) x-3 = 10

x = 10+3

x = 13

c) y+9 = 3

y = 3-9

y = -6

d) 3n+4 = 12

3n = 12-4

3n = 8

n = 8/3

IV- a) 2×(x+6) = 4×(x+2)

2x+12 = 4x+8

12-8 = 4x-2x

4 = 2x

4÷2 = x

2 = x

b) 5×(2x-1) = 2×(x+4)

10x-5 = 2x+8

10x-2x = 8+5

8x = 13

x = 13/8

c) 4×(x+3) = 5×(x+2)

4x+12 = 5x+10

12-10 = 5x-4x

2 = x

V-