Write an equation of the line that passes through $\left(18,\ 2\right)$ and is parallel to the line $3y-x=-12$ .

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.