Question

alguém responde essas perguntas pra mim pfvr

Answer 1

Resposta:

Explicação passo a passo:

5)
x + y + z = 142
x = y/10
z = y + 100
(x + y + z = 142) = (y/10 + y + y + 100 = 142)
21y/10 = 42
21y = 420
y = 20
x = y/10 ... x = 2
z = y + 100 ... z = 120
6)
x + y + z = 141
y = x + 2
z  = y + 2 ... z = (x + 2) + 2
(x + y + z = 141) = (x + x + 2 + x + 4 = 141)
3x + 6 = 141
3x = 135
x = 45
y =  47
z = 49
7)
|50.x + 20.y = 3880
|x + y = 80 (x = 80 - y)
50.x + 20.y = 3880 ... 50.(80 - y) + 20.y = 3880
4000 - 50y + 20y = 3880
30y = 120
y = 4
(x = 80 - y) = x = 76