<span>the line through points (-1,-2) and (5,3) slope=(3-(-2))/(5-(-1))=5/6 for a perpendicular line slope =-6/5=-1.2 y=(-6/5)x+b 7=(-6/5)*3+b 7=-18/5+b 7=-36/10+b 7=-3.6+b b=10.6 y=-1.2x+10.6</span>
37 minutes. he does 10m every 2 minutes until he does 180m for 36 minutes. then he does 20m for 1 minute bc the wave doesn't take him back. so it's 37 minutes