Answer:
Step-by-step explanation:
Triangle TUR is equilateral and TRS is isosceles. They share same side TR
∠URT and ∠TRS are supplementary,
∠URT = 60° as angle of equilateral triangle,
∠RTS ≅ ∠RST (isosceles)
4x+y=9
4(2)+(1)=9
8+1=9
9=9
It is a solution
1) c.
2) d.
Hope this helps :)