For this problem, we are given the value of a hotel charge before taxes, then we are informed of the taxes on two hotels in different cities, and the total value paid for these taxes. We need to create a system of linear equations for the situation and determine the value of the charges before taxes for each city.
We know the total value paid in taxes, therefore we have:
[tex]\begin{gathered} 0.075\cdot x+0.065\cdot y=707.5\\ \\ y=x-1500 \end{gathered}[/tex]We can solve the second equation, and then replace the found value for y on the first equation. We have:
[tex]\begin{gathered} 0.075\cdot x+0.065\cdot(x-1500)=707.5\\ \\ 0.075\cdot x+0.065x-97.5=707.5\\ \\ 0.14x=805\\ \\ x=\frac{805}{0.14}=5750\\ \\ y=5750-1500=4250 \\ \\ \\ \\ \end{gathered}[/tex]They spent $5750 on the first city and $4250 on the second city.