exam Maths Puzzle Numerical Ability

I really need help with this problem as soon as possible. Thank you and have a nice day.

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exam Other Question

Answer the following three problems using Addition, Graphing, or Substitution Method. Each method will be used once, and indicate which method you used.

x+3y+4
x=3

1/5x+1 please help! Thanks
Factor completely:
x2 – 5x – 14