Two start up companies start at the same time. Company A sates their annual profit follows a Linear model...

Two start up companies start at the same time. Company A sates their annual profit follows a Linear model p (x) 10x-7, where x is the number of units sold, and Company B states their annual profits follows a radical function p (c)=15sqrtx-1+3, where x is the nubmer of units sold and > than 1, how do I solve these equations?