Where’s the figure at there’s only the questions
So standard form is Ax+By=C
Since the problem is already in that form you don’t need to switch it around however A has to be more than 0 (so positive). Divide the equation by -3 to get the answer x-4y=-8
The distributive property: a(b + c) = ab + ac
-3(7b + 1) - 4(-b + 3) = -3(7b) - 3(1) - 4(-b) - 4(3)
= -21b - 3 + 4b - 12 = -17b - 15
He is writing at 4/3 pages per hour or 1 1/3 pages/hr.