Ax = b, where a and b are constants.
2. Solution:
When a≠0, the equation has a unique solution:
x=b/a
When a = 0, b is not equal to zero.
The original equation is: 0x = b,
Because zero times any number is zero.
So the original equation has no solution.
When a = 0 and b = 0, the original equation is:
0x=0,
No matter what x is, this equation holds.
So the solutions of the equations are all real numbers.
For your reference, please take it.