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  1. check above link.

    graphically?   well, you graph them both, the solutions is where they both intersect each other, since there are two solutions, meaning they will meet twice, or namely the linear will run into the quadratic curve twice, and where they meet, those x,y coordinates are the solutions to the system.

  2. excluded value is x = - 4

    The denominator of the rational expression cannot be zero as this would make the fraction undefined. Equating the denominator to zero and solving gives the value that y cannot be.

    solve y + 4 = 0 ⇒ y = - 4 ← excluded value

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