A point both of whose coodinate are negative will be in

A point both of whose coordinates are negative will lie in

A point both of whose coordinates are negative lies in quadrant

Prove that all the vertices of an equilateral triangle can not be integral points (an integral point is a point both of whose coordinates are integers).

Prove that all the vertices of an equilateral triangle can not be integral points (an integral point is a point both of whose coordinates are integers).

The number of points in space, whose each co-ordinate is a negative integer such that x +y+z+ 12= 0

The number of points in space,whose each co- ordinate is a negative integer such that x+y+z+12=0