Answer:
3. ASA
4. Corresponding sides of congruent triangles are congruent
Step-by-step explanation:
I marked this in the attached image. ∠B ≅∠E, ∠ACE ≅ ∠DCE, and the side between them BC ≅ EC, so the the triangles ΔACB and ΔDCE are congruent by ASA.
If the triangles are congruent, then all corresponding angles and sides are also congruent.
Distribute.
3(x+6)
3x+18
8(x-3)
8x-24
3x+18+8x-24
Combine like terms.
11x-6= 27
Add 6 to the other side.
11x= 33
Divide both sides by 11.
x=3
I hope this helps!
<em>~cupcake</em>