ATP coupling uses ATP hydrolysis to “power” a nonspontaneous reaction (positive delta G).
To figure out the new delta G for the reaction, add the two values together.
For example:
Glucose → P-Glucose Delta G=15kJ/mol
ATP→ ADP + Pi Delta G= -30.5kJ/mol
If you couple these two together, there will be a final Delta G of -14.5kJ/mol, indicating it will now proceed spontaneously.