Question

3) Resolva as inequações U = N

a) 2x + 5<- 3x +40
b) 6(x - 5) - 2(4x +2) > 100
c) 7X-9 < 2x + 16
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Answer 1

a) 2x+5< -3x+40

2x+3x <40-5

5x <35

x < 35/5

x<7

b) 6(x-5)-2(4x+2)>100

6x-30-8x-4>100

6x-8x>100+4+30

-2x>134.(-1)

2x <134

x <134/2

x <67.

c) 7x-9<2x+16

7x-2x <16+9

5x <25

x <25/5

x <5

Answer 2

Resposta:

(PASSO A PASSO)

A) 2x+3x < 40-5

5x<35

x<35/5

x<7

B) 6x-30-8x+4>100

6x-8x>100+30-4

-2x>126

x>126/2

x>63

C) 7x-2x<16+9

5x<25

x<25/5

x<5