Suppose a mathematician's calculator has a function that computes the slope and intercept of a line. The requirement in the definition document reads:" The calculator shall accept as input an equation of the form Ax + By + C = 0 and print out the slope and intercept. "The system implementation of this requirement is the function LINE whose syntax is LINE(A,B,C), where A and Bare the coefficients of x and y, and C is the constant in the equation. The result is a printout of D and E, where Dis the slope and E the intercept. Write this requirement as a set of causes and effects, and draw the corresponding cause-and-effect graph.