An executive invests $23,000, some at 8% and the rest at 7% annual interest. if he receives an annual return of $1,800, how much is invested at each rate?

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.