book Maths Puzzle Numerical Ability

please help me. graph the function
f(x)=
-4
------
x

for values of x where -8&#8804; x < 0 and 0< x &#8804;8

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book Other Question
Two angels are complementary. If the measure of one angle is x degrees, represent the measure of the other angle as an expression in x. Students sent flowers costing $20 to a sick classmate. There were 4 fewer students contributing than was planned, requiring of the others to pay 25 cents more than their original share. How many students contributed to buying the flowers?