Linear algebra: horizontal shear

show the effect of the horizontal shear H on the unit square.
H=
1, 1.2
0, 1
How do you do this problem, where to start?
Thank you

consider the vectors for the corners < 0 , 0 > , < 1 , 0 > , < 0 , 1 > , & < 1 , 1 > { A , B , C , D }

HA = < 0 , 0 > , HB = < 1 , 0 > { both not moved }

HC = < 1.2 , 0 > , HD = < 2.2 , 1 > { top moved 1.2 units to the right...sheared }