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

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

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

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