Question

calcule as equaçoes inequaçoes e sistema

a)x+y=20
x-y=8


b)5(x+5)<4-2x+8

Answer 1

a)x+y=20
x-y=8

2x=28
x=28/2
x=14

x+y=20
14+y=20
y=20-14
y=6

b)5(x+5)<4-2x+8
5x+25+2x<12
7x<12-25
7x<-13
x<-13/7

:)

Answer 2

a)x+y=20
x-y=8
2x=28
x=28/2
x=14
x+y=20
14+y=20
y=20-14
y=6
b)5(x+5)<4-2x+8
5x+25+2x<12
7x<12-25
7x<-13
x<-13/7