Question

procedimiento de {x+3y=4
2x-y=1​

Answer 1

x+3y=4

2x-y=1⇒y=2x-1=2·1-1=2-1=1

x+3(2x-1)=4

x+6x-3=4

7x-3=4

7x=4+3

7x=7

x=1

x=1

y=1