Hello all,

It's been many years since I attempted a problem of this kind (apparently, a basic coordinate geometry question). Your help would be much appreciated.

So here it is,

"Let us assume that we have a line from coordinates E1, N1 to E2, N2. What we want to know is where this line will intersect a particular line that runs from North to South."

"If we know the coordinates of the two points and the Easting value of the line, how do we calculate the coordinates at which the projected line between the two points crosses the N-S line.?"

*I can find the midpoint of two lines, and the distance between, but not the very point at which they intersect. I'm trying to do this on an Excel Spreadsheet by the way! (also new to me)

E1 2607.05 N1 3518.08 E2 3746.93 N2 3734.63These coordinates make up one Line. The easting value of the line is 4000.

All other given info is as follows:

"Label cells A9 and A10 with

**DeltaE ** and

**DeltaN **respectively and enter in formulae to calculate these values in cells B9 and B10 (Hint: remember that a delta value represents a difference in values, so DeltaE will be the difference between E1 and E2)." Therefore, DeltaE=1139.88, and DeltaN=216.55

"Label C9

**Bearing(rad) ** and C10

**Bearing(degs). **In D9 enter the formula

**=ATAN(B9/B10) ** and in D10 enter

**=Degrees(D9)" **

*Don't worry about the Degrees and Radians bit.

"Devise a formula to enter into cell D5 so that the northing of the point where the extended line between the two points crosses the

** 4000 East** edge."

Sorry to draw this out so much, but I've at least included every detail!

Basically, I need a formula to find the intersection of two lines.

Thanks again