Ⅰ. x 4 – 227 = 398 Ⅱ. y 2 + 321 = 346

According to question ,we can say that
From equation Ⅰ. x⁴ = 398 + 227 = 625
⇒ x⁴ = 5⁴
From equation Ⅱ. y² = 346 - 321 = 25
⇒ y² = 5²