What is the equation of the line in slope intercept form (y=mx+b) that passes through the point (-1,-1) and has a slope of -6

Margaret is purchasing a house for $210,000 with a 15 year fixed rate mortgage at 4.75% interest she has made a 5% down payment the house is valued at 205,000 and the local tax rate is 3.5% homeowners insurance 600 per year what are her total monthly payment