Question

resolva as inequações do 1º grau, sendo U = R
a) x + 1 + x ≤ - x + 21

b) 2 ( x + 1) ≥ 3 (x - 1)

c) + ( x² + 1 ) ≤ (x + 1 )²

d) x - 10 + x > 2 (x + 1 )

e) 2y + 1 < 3 + 7y

POR FAVOR

Answer 1

a) x+1+x≤-x+21
2x+1+x≥21
3x≥21-1
x≥20/3

b) 2.(x+1)≥3.(x-1)
2x+2≥3x-3
3x-2x≤-3-2
x≤-5

c) x²+1≤(x+1)²
x²+1≤x²+2x+1
x≥2

d)x-10+x>2x+1
     x=∉

e)2y+1<3+7y
7y-2y>3-1
5y>2
y>2/5