Answer:
The correct answer is B. y = 5
Step-by-step explanation:
Let's recall that two are triangles are similar when its side lengths are proportional. That is in our case, if Δ ABC is similar to Δ DEF , then the following equation holds:
EF/BC = DF/AC
Replacing with the real values:
6/12 = y/10
Cross multiplication:
12 * y = 10 * 6
12y = 60
y = 60/12
y = 5
The correct answer is B. y = 5
