exam Maths Puzzle Numerical Ability

Determine the function being displayed by linear data below:

x| 2 | 5 | 7 | 10
y| 22| 52| 72| 102

y=____________

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exam Other Question
y=(x-3)(x-5)(x-a), solve for a? Solve the system for each variable:
2x+y-z=-3
-x+2y+z=5
2x+3y-2z=-3