![]() You may need to re-write the equations before beginning your solutions. So, while you can substitute into either equation, you have to beware extraneous solutions and check your answers with all the original equations, because those are constraints on your answer. When working with systems, r emember that the equations of lines may appear in a variety of forms, such as: y = 2 x + 1 -5 x + y = 7 4 x + 2 y = -5 y = 7 The linear equation is usually more straightforward in providing constraints and fewer extraneous answers.
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