exam Maths Puzzle Numerical Ability

square root of x2-5x+49 = x+2

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exam Other Question

How do you figure this out when y is isolated on both equations:
y=3x+1
y=6x-1

Thank you
f (x)  x2  7x  10; find (a) f (0), (b) f (5), and (c) f (2).