Find the solution to the system of equations. You can use the interactive graph below to find the solution.
\begin{cases} y=-7x+3 y=-x-3 \end{cases}
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y=−7x+3
y=−x−3

Atruck can be rented from company a $50 a day plus $0.60 per mile. company b charges $20 a day plus $0.80 per mile to rent the same truck. find the number of miles in a day at which the rental costs for company a and company b are the same