Question

Resolva as inequações u=n
A) 2x+5<-3x+40
B)6(x-5)-2(4x+2)>100
C)7x-9<2x+16

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

A) 2x + 5 < 3x + 40
2x - 3x < 40 -5
- x < 35(multiplicando por - 1)
x > 35
B) 6(x-5) - 2(4x + 2)> 100
6x - 30 - 8x - 4 > 100
6x - 8x < 100 + 30 + 4
- 2x < 134(multiplicando por - 1)
2x > - 134
x > -134/2
x > - 67
C) 7x - 9 < 2x + 16
7x - 2x < 16 + 9
5x < 25
x < 25/5
x < 5