exam Maths Puzzle Numerical Ability

Please help I have been trying to figure this problem out but am unable to even get started

-9x+2y=2
+6x+8y=-6

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exam Other Question

The number 64 is divisible by its units digit (4). How many whole numbers less than 64 are divisible by their respective units digit? find the equation of the line perpendicular to the line x=4 and passing through the point (4,2).