given the two vectors q= {56, -31} and r += {83,92} , what is the difference q-r
If q = (x1, y1) and r = (x2, y2) then q - r = (x1 - x2, y1 - y2).
For this problem: q - r = ( 56 - 83, -31 - 92 ) = ( -27, -123 ).
