It has been noted from the past that the price of altcoins follows the price of the bitcoin that means when the price of bitcoin is high then the price of altcoins rise high. Actually this relationship is not proved by any research but it is built on the basis of the previous experience.
The both of them react base on the needs just like what we have noticed that yheir are times that Bitcoin will raise and Altcoin will raise too but their are time both will down. It is not a hindrance not to invest because it is a start up to let it grow them both and trust is the most improtant thing.