Question

Triangle STU has reflected over line m to form Triangle S'T'U'. What is the value of y?

A. 2
B. 6
C. 3
D. 5

Answer 1

D. 5

Explanation:

The congruence of S'T' with ST tells you ...

9 = x +7

2 = x

The congruence of S'U' and SU tells you ...

4x = y +3

4·2 -3 = y = 5 . . . . substitute the value of x; subtract 3