I think it’s 55.6 square inches
Sorry if I’m wrong! :)
Y intercept is (0,-7). slope is 2.
Change the function to y=mx+b format first. m=slope and plug in 0 as x to get y intercept.
If it is 5 lawns then an easy way you could do it is dividing 28 and 2, to get 14, then multiply 5 by 14. Or you could set up a proportion which would be 2/28=5/x and solve for x by cross multiplying. The answer you should get out of this is 70 minutes. Or and hour and 10 minutes.