#1**+10 **

Equilateral triangles have all equal sides and angles.

180 deg is in one triangle and divide it among the 3 sides and you get 60 deg.

So,

5y+10=60

y=10

echofire18 Dec 6, 2018

#2**0 **

This is an equilateral triangle because all the sides are the same. The angle measures are 60.

\(5y+10=60, 5y=50, y=10\) so y is 10 degrees.

Notice we didn't even use x.

You are very welcome!

:P

CoolStuffYT Dec 6, 2018