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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book Other Question

a rectangle with dimensions of 5 x 8 is inscribed in a circle. what is the area and circuference of this circle?[ inscribed means inside the vertexs touching the edge of the circle]. n^200<5^300 find the value 0f n.