A mathematics class has studied linear equations, their graphs, and the results of multiplying both sides of an equation by a constant, or adding or subtracting two equations. Some properties of linear equations given by some of the students are stated in Exercise. In each exercise justify that the statement is valid or in error.
Brittany said that if two linear equations are added or subtracted and the result is of the form 0 = a constant, then the lines are parallel.
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