Question

quanto 2x +y=5 por favor me ajudem

Answer 1

X = 1 
Y = 3 

Porque? 

2 * 1 = 2
Y sendo 3 , fazemos a conta 2 * 1 + 3 

2 + 3 = 5

Answer 2

x = 0
2x + y = 5
2.0 + y = 5
y = 5

x = 1
2x + y = 5
2.1 + y = 5
2 + y = 5
y = 5 - 2
y = 3

x = 2
2x + y = 5
2.2 + y = 5
4 + y = 5
y = 5 - 4
y = 1

y = 1
2x + y = 5
2x + 1 = 5
2x = 5 - 1
2x = 4
x = 4/2
x = 2

y = 5
2x + y = 5
2x + 5 = 5
2x = 5 - 5
2x = 0
x = 0/2
x = 0
y = 0
2x + y = 5
2x + 0 = 5
2x = 5
x = 5/2

Resp.:
x = 2; y = 1
x = 1; y = 3
x = 0; y = 5
x = 5/2; y = 0

(2 ; 1)
(1 ; 3)
(0 ; 5)
(5/2 ; 0)