An infinite sheet with a negative surface charge density run

An infinite sheet with a negative surface charge density runs parallel to the x axis.  Another infinite sheet with an equal but opposite sign surface charge runs parallel to the y axis.  The difference in electric potential from the point x = +7 m, y = +2.9 m to the point  x = +2.9 m, y = +7 m is 9.3 x 106 V.  What is the surface charge density in micro-coulomb/m2 for the sheet on the y axis?

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