book Maths Puzzle Numerical Ability

I NEED HELP FACTORING:
X^2 - 6X + 5

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book Other Question

4% of 25= determine whether the given ordered pair is a solution of the system of equations.

#1

(4,2); x-y=2
x+y=6

#2

(-8,-7); x-2y=6
2x-3y=5