Can you plz help me it is urgent for the 1st and second question

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.

Asystem of equations has 1 solution.if 4x-y=5 is one of the equations , which could be the other equation ?

If on=8x-8,lm=7x+4,nm=x-5,and ol=3y-6