Potential Locations

for Substations

A

B

C

D

E

F

G

Areas Covered

$2,3,7$

$4$

$5$

$5,6$

$1,2,3,4,6,7$

$5,7$

$1,2$

a$.$ Formulate an integer programming model that could be used to find the minimum mun

ber of locations necessary to provide coverage to all areas