∠1 and ​ ∠2 ​ are a linear pair, and ​ ∠2 ​ and ​ ∠3 ​ are vertical angles. m∠1=(3y+10)∘ and ​ m∠3=(5y−30)∘ . What is m∠2 ? 25° 55° 85° 95°