Write a program that prompts the user for two points in the x-y plane. input should be entered in the following order: input x₁ input y₁ input x₂ input y₂ the program: outputs the equation of the line uses if statements to determine and output whether the line is vertical, horizontal, increasing, or decreasing. if l is a non-vertical line, output its equation in the form y = mx + b. note: output all numbers with a precision of two decimal places.