Originally Posted by
antikv please help turn this vector equation [x,y,z]=[3,7,-5]+s[1,2,-1]+t[1,-2,3] into a scalar equation
in the form of x+y+z+D=0
i understand in the case of [x,y]=[3,7,-5]+s[1,2,-1]
the direction vector is [1,2,-1] and the normal vector is [3,7,-5]
all i need to do in this case was to do
as the following
[x-1](3)+[y-2](7)+[z+5](-5)
which would give me the scalar equation 3x+7y-5z-42=0
but how would you find the scalar equation if you have 2 direction vectors?
i have a quiz tommorwT_T but still dont get this question... OTL
hugs and kisses to anyone who can help/solve it for me....thanks in advance