2х + 3 = 5х – у
Complete the missing value in the solution to the equation?

This is so harddd! solve. 1 + 1 = solve 4 + 4 = solve 3 x 3

Pls! does anybody know a shortcut for answering these types of questions in the future?

Non-euclidean geometry was discovered when, in seeking cleaner alternatives to the fifth postulate, it was found that the negation could also be true a. true b. false