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- The equation of the form $lx+my+nz=d$ where $l,m,n$ are the direction cosines of the normal to the plane,and $d$ is the distance of the normal from the origin.
- The coordinates of the foot of the perpendicular is $(ld,md,nd)$.

Step 1:

The given equation of the plane is $3y+4z-6=0$

This can be written as $0x+3y+4z=6$------(1)

Hence the direction ratios of the normal are $0,3$ and $4$

Therefore $\sqrt{0^2+3^2+4^2}=5$

Step 2:

Dividing on both sides of equ(1) by 5 we get

$\large\frac{3}{5}$$y+\large\frac{4}{5}$$z=\large\frac{6}{5}$

Therefore the coordinates of the foot of the perpendicular are $(ld,md,nd)$

(i.e) $\big(0,\large\frac{3}{5}$$\times\large\frac{6}{5},\large\frac{4}{5}$$\times \large\frac{6}{5}\big)$

$\Rightarrow \big(0,\large\frac{18}{25},\frac{24}{25}\big)$

Hence the coordinates are $\big(0,\large\frac{18}{25},\frac{24}{25}\big)$

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