[" Whify that "-(-x)=x" for "],[qquad y=(11)/(15)]

Verify that -(-x) =x for . x= (11)/(15)

Verify that -(-x) =x for x = frac(11)(15)

Verify that -(-x)=x for: x=11/15

Verify that – (– x) = x for. x=11/15

Find the length and the foot of the perpendicular drawn from the point (2,-1,5) to the line (x-11)/(10)=(y+2)/(-4)=(x+8)/(11)

If x/11=15 , then x=11/15

Find the value of(x+y) if 15x+17y=21,17x+15y=11.

Find the value of (x+y) and (x-y) , if (i) 15x-17y=11 , 17x-15y=21 . (ii) 12x+13y=29 , 13x+12y=21 .