Different subsets in R^2/Sketch/4/Exercise

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

1. ${}{\left\{(x,y)\mid 2x=5{\text{ and }}y\geq 3\right\}}$,
2. ${}{\left\{(x,y)\mid -3x\geq 2y{\text{ and }}4x\leq -5y\right\}}$,
3. ${}{\left\{(x,y)\mid y^{2}-y+1\leq 4\right\}}$,
4. ${}{\left\{(x,y)\mid xy=0\right\}}$.

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