Question

x + 5y =21
x-y =2 calcula "x"

Answer 1

5x-5y=10

x+5y=21

6x=31

x=31/6

31/6-2=y

31/6-12/6=y

19/6=y

x-y=2

31/6-19/6=2

12/6=2

2=2