exam Maths Puzzle Numerical Ability

the sum of two number is 80

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exam Other Question

Hello...um i need to find the Value Of X and Y

4x=-5y+40
x=-y+9

i know itz pretty easy but i kinda forget everything during the summer...can u plz help me..it will b greatly appreciated =]
quadratic function in standard from of

(0,3) (1,-4) (2,-9)