If ∆jkl ≅ ∆pqr, which one of these is not a pair of corresponding parts? ∠j and ∠p and ∠l and ∠r and

When trying to prove that two triangles are congruent there are three congruency rules SAS, ASA and SSS. From the looks of things though I would say it would be the third one because just from the way you named the triangles I could tell that the two angles could correspond.

3x+9+4x+x=8x+9that's the answer for your question.