What is because like I need this answer fast 3n+1<7

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

The input to the function is x and the output is y. write the function such that x can be a vector (use element-by-element operations). a) use the function to calculate y(-1.5) and y(5). b) use the function to make a plot of the function y(x) for -2 ≤ x ≤ 6.

Cd is the perpendicular bisector of both xy and st, and cy=20. find xy.