Question: What would be the best first step in solving this system?y = x + 3x - 42x+y = 17A. Substitute for x in the first

What would be the best first step in solving this system?y = x² + 3x - 42x+y = 17A. Substitute for x in the first equation.B. Isolate x in the second equation.C. Substitute for y in the second equation.D. Isolate x2 in the first equation.

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