Answer:
a=13 b=13
Explanation:
Because the triangles are congruent, their corresponding angles will be congruent, too.
So, ∠Y≅∠S and ∠Z≅∠T.
Set the values of these angles equal to each other and solve.
∠Y≅∠S ∠Z≅∠T
4a-4= 48 5b-3= 62
4a=52 5b= 65
a=13 b= 13