When you have to find a parallel line, you take the slope of the other line, so we already know y=3x+b. Then, plug in 2 and -4 as your x and y values and you get -4=3(2)+b. Then solve 3×2=6, so -4=6+b, subtract 6 from both sides, -10=b.
This is true because for a square, all angles and sides are equal. That is no side has a longer length than the other. The diagonals of a square are therefore perpendicular bisectors of each other.
I hope this is clear, please mark as brainliest answer
