The question makes little general sense because the concept of slopes is appropriate when dealing with equations in only two variables.
Assuming, therefore, that there are only two variables, then either the slopes are the same or they are different,
If the slopes are the same and the intercepts are the same: there are infinitely many solutions
If the slopes are the same and the intercepts are different: there are no solutions
If the slopes are different: there is a unique solution.
Yes, both kinds exist.
Three different kinds: none, one and infinitely many.
kinds of headline according to structure
There can be linear equations with 1, 2, ... variables. Each of these is different since an equation with n variables belongs to n-dimensional space.
two
why are different kinds of models created to represents something like the solar system
research is according to goal
System, Aplication and Programming
800
The answer depends on the nature of the equation. Just as there are different ways of solving a linear equation with a real solution and a quadratic equation with real solutions, and other kinds of equations, there are different methods for solving different kinds of imaginary equations.
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three of the body system are radial , bilateral , asymmetry.