Gogeta SSJ GOD SSJ 1000 ultra istinct kaio-ken x50 vs. SHAGGY the dominator of the multiverse (DEATH BATTLE)

What are “like terms”? why can we only add like terms?

Can someone me do math because i am having a breakdown rn because i don’t get it

Write an equation of the line that passes through the point (2, 3) and is perpendicular to the line x = -1. a) y = 1 b) y = 3 c) y = 0 eliminate d) y = -3