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We're are asked to write all $x$-values greater than $5.$ Let's start with $x$ and $5.$ $x?5$ What sign should be between $x$ and $5?$ The sign for greater than is $>$ so the inequality is $x>5.$

b

We can start by writing the smallest value to the left and the greatest to the right and $y$ in the middle. $-2?y?8$ What should be instead of question marks? $y$ should be less than or equal to $8$ so the right-hand inequality sign should be $≤.$ $-2?y≤8$ But $y$ should also be greater than $-2,$ that is $y>-2.$ By rearranging this inequality we get $-2<y.$ This means that $<$ is the left-hand inequality sign. $-2<y≤8$