1.

The lines which intersectthe skew lines `y=m x ,z=c ; y=-m x ,z=-c`and the x-axis lie on the surfacea. `c z=m x y`b. `x y=c m z`c. `c y=m x z`d. none of theseA. `cz=mxy`B. `xy=cmz`C. `cy=mxz`D. none of these

Answer» Correct Answer - c
Equations of the planes through `y=mx,z=candy=-mx,z=-c` are respectively,
`(y-mx)+lamda_(1)(z-c)=0" "(i)`
and `(y+mx)+lamda_(2)(z+c)=0" "(ii)`
It meets at x-axis, i.e., y=0=z.
`becauselamda_(2)=lamda_(1)`
From (i) and (ii), `(y-mx)/(z-c)=(y+mx)/(z+c)`
`becausecy=mzx`


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