I'm really stuck on these two questions and would appreciate it very much if I could get some help.
1) Solve this algebraically:
x + y = 9
x^2 - 3xy + 2y^2 = 0
2) Solve this: (leave your answer as a surd)
16x^4 - 4x^2 = 25
An explained answer would be amazing, as I want to learn the technique. Thank you very much!
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