What is the result of subtracting the second equation from the first?
\begin{aligned} 2x+7y &= -8 2x-5y &= -1 \end{aligned}
2x+7y
2x−5y


=−8
=−1

Technicians have installed a center pivot, circular irrigator for a farm that covers 25 acres. a.) how long is the irrigation boom (in feet) from the center pivot to its farthest extent? b.) if the irrigation boom makes 4 full revolutions in a day, how many miles does the end of the boom travel in 5 days?