PLZZZ I will give brainiest and 90 points PLZ question 6 is soo confusing plzzz

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=

Determine if the equation defines y as a function of x: 2xy = 1. yes o no

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.