Question

A ray stands on line. if x =30 .find y

Answer 1

y + x = 180
y + 30 = 180
y = 180-30
y = 150

Answer 2

Given. A ray Stands on a Line...

So x and y are supplement of each other...

So x+y=180°
→30°+y=180°
→y=180°-30°=150°


So y is 150° if x and y are supplement of each other OR if they are in a linear pair...

And Since only a Ray is Given. y cannot be opposite to x but only linear or adjacent so...

y=150° is your answer...

Hope it Helps...
Regards,
Leukonov.