Answer:
Let x = the charge in 1st city before taxes
Let y = the charge in 2nd city before taxes
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Set up equation before taxes.
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y = x - 1500 Â Â Â Â eq1
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Set up equation for total tax paid.
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0.065x + 0.06y = 378.75 Â Â Â Â eq2
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Substitute eq1 into eq2.
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0.065x + 0.06(x - 1500) = 378.75
0.065x + 0.06x - 90 = 378.75
0.125x - 90 = 378.75
0.125x = 468.75
    x = 3750
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Substitute this value of x into eq1.
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y = 3750 - 1500
y = 2250
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The hotel charge in city one is $3750 and the hotel charge in city two is $2250