
These
should be titled: first line = A_{1}A; second line = B_{1}B...
Points on vertical lines should be labled A_{1},_{ }B_{1},
C_{1}, ... Z_{1}, AA_{1}, BB_{1}
Points on horzontal lines should be labled A, B, C, ... Z, AA, BB 
 coordinates (x_{1},y_{1})
of the first endpoint of a segment.

The
coordinates should be in two different columns. (See Columns A and B,
above.) 
 cordinates (x_{2},y_{2})
of the second endpoint of that segment.

These
coordinates should also be in two different columns (See Columns D and
E, above.) 

m=(Y_{2
} Y_{1})/(X_{2 } X_{1}).
1. Click in the cell just
below "Slope..." (F2)
2. Type an = sign in this cell.
3. Type a parenthesis, then click on a known y_{2} and subtract a second known y_{1}
form the same row.
4. Divide by the difference between the (x_{2 } x_{1}).
Be sure to use the addresses of the boxes, not the actual numbers or
values.
5. Press Enter, then
highlight the number that appears and the rest of Column F.
6. With the cells in Column F highlighted, find Fill in Edit, and
click on Down (CtrlD). All of the values for slope should appear. 

b = ymx
1. Click in the cell just
below "yintercept..." (G2)
2. Type an = sign in this cell.
3.
Insert a know y_{1 }by clicking, for example, on C2.
4. Subtract the slope in this row ( F2)
5. Click on the star at the top of 8 (*) to show that you are
miltiplying by a known x_{1}.
6. Click on B2.
7. Enter, then highlight Column G, find Fill in Edit, and click on
Down. All of the values for the yintercepts should appear.
NOTE: Select all
the cells that either have numbers in the already or that will have
numbers, and go to Cells in Format. Click on the Number tab, then
click on Number, and Click on Fraction and Up to two numbers. 
 equation for each
of the line segments

Write the equation for each
line using the yintercept form: y = mx + b. See these examples in
Column H:


