The shape of a planet's orbit a. depends on its speed b. is determined by the foci

it is a it's just science

I think it is B but I am not 100% sure

i think that the best answer would be c.

tell me if im wrong : )

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

: -)