Rose L.

asked • 28d

Programming 4-21

Let l be a line in the x-y plane. If l is a vertical line, its equation is x = a for some real number a.


Suppose l is not a vertical line and its slope is m. Then the equation of l is y = mx + b, where b is the y-intercept.


If l passes through the point (x₀, y₀), the equation of l can be written as y - y₀ = m(x - x₀).


If (x₁, y₁) and (x₂, y₂) are two points in the x-y plane and x₁ ≠ x₂, the slope of line passing through these points is m = (y₂ - y₁)/(x₂ - x₁).

Instructions


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.

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