(Algebra: solve linear equations) Write a method that solves the following 2 × 2 sys...

(Algebra: solve linear equations) Write a method that solves the following 2 × 2 system of linear equations:

The method header is

public static double[] linearEquation(double[][] a, double[] b)

The method returns null if is 0. Write a test program that prompts the user to enter and displays the result. If is 0, report that “The equation has no solution.” A sample run is similar to Programming Exercise 3.3.

Ref:

(Algebra: solve 2 × 2 linear equations) You can use Cramer’s rule to solve the following 2 × 2 system of linear equation:

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”.