book Maths Puzzle Numerical Ability

Can u please show me hwo to solve just some of these problems that I had listed. Thank you

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book Other Question

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 what is the value of n in 3times10^n when ur tring to fing 300billion