It is impossible to figure it out with just one coordinate and no line. Maybe your line extends through the x and y system and you were given one coordinate. Take that coordinate and find the rise over run (slope). Follow that rise over run all the way to the y-axis. Whatever point you are on once you hit the y-axis that is the y-intercept.
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By solving the simultaneous equations the values of x and y should be equal to the given coordinate
The y intercept will be the ordinate(y value) in the given co-ordinate.
That will depend on the 3rd coordinate which has not been given
1 minute is 1/60 degrees and 1 second is 1/60 minutes
If Y = 0 then there is no value of X such that XY = 1.