Stacy rowed across the lake with her friend rainey (in the same boat) at a rate of 4 mph. rainey then rowed back at a rate of 3 mph. if the lake is 6 miles across, how long did it take them to complete their trip?

it's d.

step-by-step explanation:

because: -1(4x + 1y) +2 (1x-3y) distribute each number into the parenthesis.

then you would get: -4x - 1y + 2x -6y combine like terms

and get: 2x -7y

hope my answer has you if not then i'm sorry.