Question

Calcule as inequações abaixo;

a) 7x + 6 > 4x + 7

b) 10x < 5- 4. (2 -3x)

c) x + 15 > 21

Answer 1

a)

$7x+6>4x+7\\7x-4x>7-6\\3x=1\\x=\frac{1}{3}$

b)

$10x<5-4(2-3x)\\10x<5-8+12x\\10x-12x<-3\\-2x<-3 (-1)\\2x>3\\x=\frac{3}{2}$

c)

$x+5>21\\x>21-5\\x>16$