which is most likely to be the first step in solving a system of nonlinear equations by substitution

A set of two or more equations in two or more variables that includes at least one nonlinear equation is referred to as a system of nonlinear equations.

The method to solve a system of nonlinear equations by substitution is-

Figure out each equation's graph.
One of the equations should be solved for either variable.
Fill in the other equation using the expression from step 2.
Put the resultant equation to use.

The importance of systems of nonlinear equations are-

They aid in a lot of our everyday predictions.
In addition, nonlinear equations need not involve numbers.
Sometimes you have to deal with the numbers, but more often than not you are only dealing with the graph's shape, and in such case it pays to be aware of the characteristics of certain shapes.

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The complete question is-

Which is most likely the first step in solving a system of nonlinear equations by substitution?

A. Substituting a number for one of the variables

B. Substituting one equation into the other equation

C. Isolating a variable in one of the equations

D. Taking the square root of both sides of one of the equations