book Maths Puzzle Numerical Ability

Algebraically show whether the point M(2,-3) is on the line defined by
3x - 6y + 1 = 0

Can i please get some help with this question?

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please help solve

a over a+1 + 2a+4 over a^2-3a-4 = 2 over a-4
show work
3- absolute value of 2x+4 greater than or equal to 1