line 1: y =4,590,000 +(3,000/45,000)x =4,590,000+(1/15)x... line 2: x=438,000 +(9,000/15,000) y... or y=(15,000/9000)*(x-438,000)... y=(5/3)*(x-438,000)... so: 4,590,000+(1/15)x=(5/3)*(x-438,000)... (5/3)x -(1/15)x =4,590,000+(5/3)*(438,000)... (25/15)x -(1/15)x=4,590,000 +730,000... (24/15)x=5,320,000... x=(15/24)*5,320,000... x=3,325,000... from line 1, y=4,590,000+(1/15)x... y=4,590,000+221,666.66... y=4,811,666.666