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Determine whether the relations R1 and R2 are equivalence relations to the specified quantity and, if...

Determine whether the relations R1 and R2 are equivalence relations to the specified quantity and, if necessary, determine the corresponding equivalence classes.

∀x, y ∈Z: x ~R1 y ⇐⇒ x + y is divisible by 2,

∀ g, h ∈ {t: t is a straight line in R2}: g ~R2 h ⇐⇒ g and h have common Points.

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