Of the methods for solving systems of equations, which is best used when opposite coefficients exist or can easily be created of either the x or y term? Graphing
Elimination
Substitution
None of the methods are appropriate for this situation.

Nina has prepared the following two-column proof below. she is given that ∠oln ≅ ∠lno and she is trying to prove that ol ≅ on. triangle oln, where angle oln is congruent to angle lno nina made two errors in the proof. identify and correct the errors.