Chapter 3 Exercise 3, Introduction to Java Programming, Tenth Edition Y. Daniel LiangY.

*3.3 (Algebra: solve 2 * 2 linear equations) A linear equation can be solved using Cramer’s rule given in Programming Exercise 1.13. Write a program that prompts the user to enter a, b, c, d, e, and f and displays the result. If ad - bc is 0, report that “The equation has no solution.”

import java.util.Scanner;
 
public class ProgrammingEx3_3 {
 
 public static void main(String[] args) {
 
  Scanner input = new Scanner(System.in);
 
  System.out.print("Enter a, b, c, d, e, f:");
  double a = input.nextDouble();
  double b = input.nextDouble();
  double c = input.nextDouble();
  double d = input.nextDouble();
  double e = input.nextDouble();
  double f = input.nextDouble();
 
  if (a * d - b * c == 0) {
   System.out.println("The equation has no solution.");
   System.exit(0);
  }
 
  double x = (e * d - b * f) / (a * d - b * c);
  double y = (a * f - e * c) / (a * d - b * c);
 
  System.out.print("x is " + x);
  System.out.println(" and y is " + y);
 
 }
 
}