Math question that is bugging me. I just really don’t get it at all

Question

you invested 6000 between two accounts paying 5 and 7 annual interest, respectively. if the total interest earned for the year was $400, how much was invested at each rate?

Answer 1

I believe you were saying 5% and 7%, and you are finding the proportion of each investment from 6000, so x and (6000 - x)

x * 0.05 + (6000 - x) * 0.07 = 400

Answers would be x and (6000 - x)