# If a,b,c are algebraic length of perpendiculars dropped from P(-1,2,-3) to xy plane, yz plane and xz plane respectively. Then a-b+c equals

Co-ordinate of a point -

Consider a point P(a,b,c) in space and drop a perpendicular from it on XY plane the algebraic length of this perpendicular is called z cordinate. Now from this point draw perpendiculars to X and Y axes, the algebraic length of these perpendiculars is known as x and y co-ordinate respectively.

- wherein

a will be z-coordinate = -3

b will be x-coordinate = -1

c will be y-coordinate = 2

a-b+c = -3-(-1)+2=0

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