exam Maths Puzzle Numerical Ability

I am having problems with this. Need to solve and graph it.

y=x^2-5x-4 or y= 3/4x-2x

using -b/2a

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exam Other Question
Simplify. Write your answer with positive exponents only.

(b^2)^-6/b^-4

Please help me with this problem.
Thanks Can you please help?
Solve the system by substitution or elimination
a)....2/x+3/y=16
-1/x+2/y=6

b)....solve for x
|x...3..|
|2...x+1| }all = DET 16

c)...x^2+y^2=7