exam Maths Puzzle Numerical Ability

In electronics, circuit gain is modeled by
G = Bt/R + r (lower case) t
where R is the value of a resistor, tis temperature, R (lower case)t is the value of R at temperature t, a

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exam Other Question

1.) The mailroom is on the 6th floor. The mailman goes up 2 floors to deliver the mail. Next he goes up 7 floors. Then he goes down 11 floors. What floor is he on?

Thank yall so much

how do you solve :
2x-6y=-16
5x+7y=-18