Encuentra la ecuacion de la recta que pasa por los puntos (-1, 4) y (3,2) y la ecuación de la recta perpendicular a ella que pase por el punto (1, 3)

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