Different subsets in R^2/Sketch/5/Exercise

Sketch the following subsets in ${}\mathbb {R} ^{2}$.

1. ${}{\left\{(x,y)\mid x=7{\text{ or }}y=3\right\}}$,
2. ${}{\left\{(x,y)\mid 7x\geq 3y{\text{ and }}4x\leq y\right\}}$,
3. ${}{\left\{(x,y)\mid x^{2}+y^{2}=0\right\}}$,
4. ${}{\left\{(x,y)\mid x^{2}+y^{2}=1\right\}}$.

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