exam Maths Puzzle Numerical Ability

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

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exam Other Question

could you please help me to solve this problem..it is from a question on a hand out.

find the inverse of f(x) = 3x+1 where f: R - R

i figured y=3x+1 y-1=3x and broke it down with an swer of x=y-1/3.

thanks for your help. absolute value of 2-4