6. The Kentucky Tools Machine Shop wants to develop a cost estimating equation for its monthly cost of electricity. It has the following data: Cost of Electricity (Y) Direct Labor-Hours (X) Month January April July October $7,000 $7,500 $8,500 $7,250 750 850 1,000 800 What would be the best equation using the high-low method? A) Y= $2,000+ $7.50X B) Y $2,500+ $6X C) Y= $1,500+ $8X D) Y $2,000+ $6X