tolong jawab no 2 & 4 please

2) misal √x = a dan √y = b
↔2a+b = 11
↔3a-2b = -1
➡eliminasi b
↔4a+2b = 22
↔3a-2b = -1
↔ 7a = 21
↔ a = 3 ➡ √x = 3 ➡ x = 9
b = 5 ➡ √x = 5 ➡ x = 25