Write a two step equation that involves multiplication and subtraction, includes a negative coefficien, and has a solution of x=7

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.

One line passes through (-7,-4) and (5,4) . another line passes through the point (-4,6) and (6,-9)

Car a and car b were in a race .the driver of car b claimed that his car was twice as fast as car a