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Given, a = 70°

From the diagram we can observe that, ‘a’ and ‘x’ are opposite to each other and hence they are vertical angles!

Hence their value should be equal to each other.

This gives, value of ‘x’ = value of ‘a’ = 70°.

Given, x = 85°

From the diagram we can observe that, ‘x’ and ‘y’ are opposite to each other and hence they are vertical angles!

Hence their value should be equal to each other.

This gives, value of ‘y’ = value of ‘x’ = 85°.