Question

Решите срочно и ПОДРОБНО, пожалуйста)

Answer 1

1)
x=y+1
(y+1)+y=3
2y+1=3
2y=3-1
2y=2
y=1

Answer 2

$a) \left \{ {{x-y=1} \atop {x+y=3}} \right.$
$-\left \{ {{x-y=1} \atop {x+y=3}} \right.$
$-2y=-2$
$y=1$
$=\ \textgreater \ x-1=1$
$x=2$
$b) \left \{{{2x-3y=3} \atop {3x+2y=11}} \right.$
$\left \{{{2x-3y=3} /*3\atop {3x+2y=11}/*2} \right.$
$-\left \{ {{6x-9y=9} \atop {6x+4y=22}} \right.$
$-13y=-13$
$y=1$
$=\ \textgreater \ 2x-3*1=3$
$x=0$