There are 9 boxes in a 3x3 grid.
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The lines that pass through points 4 -6 2 -3 and 6 5 3 3 on a grid are the lines y=x.
a coordinate grid
y is for up and down. x is across.
Cartesian coordinates
There are 36 unique quadrilaterals in a 3x3 square grid: 14 squares = 9 (1x1) 4 (2x2) 1 (3x3) 22 rectangles = 6 (1x2) 6 (2x1) 6 (3x3) 2 (2x3) 2 (3x2) (the total number of quadrilaterals formed by 3 x 3 pin sets will be larger, i.e. 78)