Matrix! rref!
matrices and row operations

transform this matrix to reduced row echelon form:

[2 -1. -4 | 7]
|0 -30 20 | -50|
[0 0 44 | -44]

nvm. i got it

result:
[1 0 0 | 2]
|0 1 0 | 1|
[0 0 1 | -1]

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 step statement reason 1 ∠oln ≅ ∠lno given 2 draw oe as a perpendicular bisector to ln by construction 3 ∠leo ≅ ∠neo transitive property of equality 4 m∠leo = 90° definition of a perpendicular bisector 5 m∠neo = 90° definition of a perpendicular bisector 6 le ≅ en definition of a perpendicular bisector 7 δole ≅ δone side-angle-side (sas) postulate 8 ol ≅ on cpctc nina made two errors in the proof. identify and correct the errors.