See the explanation
<h2>
Explanation:</h2>
A system that has one or infinitely many solutions is called <em>consistent. </em>If an equation in a system tells us no new information then the equations of the system are <em>dependent. </em>In other words, to find an equation that creates a consistent and dependent system with the given equation we have to get the same line:
The given line is:

If we multiply both sides of the equation by a constant we will have the same line when plotting, therefore let's multiply by 3:

So a system of two linear equation that is consistent and dependent is:

<h2>Learn more:</h2>
Graph of lines: brainly.com/question/14434483#
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Answer:
"A" IS THE ANSWER
Step-by-step explanation:
 
        
             
        
        
        
your answer is a ok i hope this helpful
 
        
                    
             
        
        
        
The value of c for which the considered trinomial becomes perfect square trinomial is: 20 or -20
<h3>What are perfect squares trinomials?</h3>
They are those expressions which are found by squaring binomial expressions.
Since the given trinomials are with degree 2, thus, if they are perfect square, the binomial which was used to make them must be linear.
Let the binomial term was ax + b(a linear expression is always writable in this form where a and b are constants and m is a variable), then we will obtain:

Comparing this expression with the expression we're provided with:

we see that:

Thus, the value of c for which the considered trinomial becomes perfect square trinomial is: 20 or -20
Learn more about perfect square trinomials here:
brainly.com/question/88561