Решите пожалуйста,буду благодарна

1) б
2) $\left \{ {{x-y=1} \atop {x+2y=3}} \right.$
$\left \{ {{x=1+y} \atop {x+2y=3}} \right.$
$\left \{ {{x=1+y} \atop {1+3y=3}} \right.$
$\left \{ {{x=1+y} \atop {3y=2}} \right.$ $\left \{ {{x=1+y} \atop {y= \frac{2}{3} }} \right.$
$\left \{ {x=1+ \frac{2}{3} } \atop {y= \frac{2}{3} }} \right.$ $\left \{ {{x= 1\frac{2}{3} } \atop {y= \frac{2}{3} }} \right.$
3) $\left \{ {{x-4y=5} \atop {-x-3y=2}} \right.*-1$
-y=7
y= -7
x=5+4y
x= 5+4*(-7)
x=5+(-28)
x=5-28
x= - 23
$\left \{ {{x=-23} \atop {y=-7}} \right.$