book Maths Puzzle Numerical Ability

HEY! I would really appreciate help with this problem. Right now we're dealing with functions and graphs so I think it needs to be set up like that. It would help if you could put

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book Other Question

what is the square root of 400 and 900 Graph the linear system and estimate the solution.Then check the system algebraically.

2x+y=9
-x+6y=-1