Answer:
∠T = 70°
RT = RS = 11
Step-by-step explanation:
The triangle is isosceles, so has congruent base angles and congruent sides.
∠T = ∠S = 70° . . . . base angles are congruent
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RT = RS . . . . sides are congruent
3x -1 = 7x -17
4x = 16 . . . . . . add 17-3x to both sides
x = 4
3x -1 = 3·4 -1 = 11 . . . . find the length of RT
RT = RS = 11 . . . . sides are congruent
