Please help

I can use the SLOPE and INTERCEPT formulas but I want to be able to
recalculate the 'best-fit' SLOPE using a defined intercept. I could do this
with the Regression data analysis tool but this seems very long winded when I
want to try out different intercepts and use them for different Y values.

Is there a simple formula I can use? TREND doesn't seem to do the job

many thanks in advance

Peter