What is the equation of the line that passes through the point (-4, -3) and has a
slope of ?

Not really sure what you mean by 'expected value per claim' 

plan a 
cust cost = 3000 ded + 750 premium = $3750
acasa cost = 6500 claim -3000 cust ded -$750 cust premium = $2750 cost to acasa.

plan b
cust cost = 1000 ded + 1200 premium = $2200
acasa cost = 6500 claim - 1000 cust ded - 1200 cust premium = $4300 cost to acasa.

hope this .