Question

$left { {{x-y=5} atop { sqrt[]{x} - sqrt[]{y} =1}} right.$

Answer 1

ОДЗ
x≥0
y≥0

√x=1+√y
x-y=5

(1+√y)²-y=5
√x=1+√y

1+2√y+y-y=5
√x=1+√y

2√y=4
√x=1+√y

√y=2
√x=1+√y

y=4
√x=1+2

y=4
√x=3

y=4
x=9