Answer:
105 = y, x = 65
Step-by-step explanation:
Remember that a triangle's external angle is equal to the sum of the 2 opposite angles.
Lets look at triangle number 2, we see that x + 40 = y
That's our first equation, now lets try and find another equation we can use.
We know that 2 triangles are similar (they have the same angles and proportional sides) if they have 2 similar sides.
These two triangles have 2 similar sides meaning that they have the same angles.
Using this we can say that x is equal to 65 degrees
to find y lets plug 65 for x into our previous equation
65 + 40 = y
105 = y
