Using the high-low method what is the y-intercept

Problem MONTH y=$5.2334x + $12,440 . UNITS SOLD 1 3,200 2 2,000 3 4,600 4 1,200 5 4,100 6 5,800 7 3,000 8 1,800 9 6,600 10 1,400 11 1,600 12 4,200 TOTAL COST $31,000 $22,000 $40,000 $18,000 $36,000 $42,000 $29,000 $17,000 $45,000 $16,000 $28,000 $32,000 TOTAL COST $50,000 $45,000 $40,000 $35,000 $30,000 $25,000 $20,000 $15,000 $10,000 $5,000 SO 0 1,000 2,000 5,000 6,000 7,000 3,000 4,000 Number of Units