exam Maths Puzzle Numerical Ability

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

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exam Other Question

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 Please expain how to do this

Let f(x) =x3 -8x2 + 17x -9. Use the factor theorem to find other solutions to f(x)- f(1) = 0, beside x =1.