Question

вкажіть розв"язок системи рівнянь:
Х+у=5,
Х-у=3

Answer 1

x+y=5
x-y=3

x=5-y
5-y-y=3

x=5-y
-2y=-2

x=5-y
y=1

x=4
y=1

$\left \{ {{x+y=5} \atop {x-y=3}} \right. \left \{ {{x=5-y} \atop {5-y-y=3}} \right. \left \{ {{x=5-y} \atop {-2y=-2}} \right. \left \{ {{x=5-y} \atop {y=1}} \right. \left \{ {{x=4} \atop {y=1}} \right.$