I need Help no links pls

Can someone me i’m confused. will give brainliest and a whole bunch of points

Jabari is power washing houses for a summer job. for every job, he charges an initial fee plus $30 for each hour of work. his total fee for a 4 -hour job, for instance, is $170 . jabari's total fee,f, for a single job is a function of the number,t, of hours it takes him to complete the job. write the function's formula.

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers