Question 1133208
answer:

6. X will be

{{{D}}}


7. Y will be

{{{A}}}

start with small triangle all way to the right that has all circles already given 
since base of that triangle have one dark circle and one with stripes, than triangle that whose third vertices is in the middle (and same base with first triangle) of the image must have circle with dots
so, triangle with {{{x}}} will have base with one dark circle and one circle with dots and {{{x}}} must be with stripes

then triangle all way below {{{x}}}  will have dark circle
then, first triangle left will have circle with stripes
finally, triangle with {{{Y}}} have one of the vertices dark and one with stripes, so {{{Y}}}   will have circle with dots

hope this explanation will help