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Find the solution(s) to the system of equations. select all that apply y=x^2-1 y=2x-2

Due to bad planning, two of the local schools have their annual plays on the same weekend. while 457 people attend one, and 372 attend the other, only 104 people were able to attend both. how many people went to at least one play?

State one method by which you can recognize a perfect square trinomial.