book Maths Puzzle Numerical Ability

Please help me graph this equation: 2y-4x<8

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Hello
I need to solve the following problem:
A company uses the function: C(x) = 2x2 � 40x + 250 to model the cost of producing x units. How many units must be made to minimize the cost?
Thanks much
Mhunter how do i transform te equation y=x�+6x+3 into the the standard equation
y=a(x-h)�+k