Question

Need help from the same last question. (I dont need to do #10)

Answer 1

8. The y-intercept is -10. You can find this by just seeing where the line would hit the y-axis. This is basically the starting point so the Scuba Diver's decent started at -10m.

9. You have the y-intercept so put that in slope-intercept form. y=mx+b

y=mx - 10

Now find the slope by picking two points and using the slope formula. I'll use 
(30,-6) and (50,-4), and then plug in the values. 30 = x1, -6 = x2, 50 = x2, -4 = -4. Simplify.

m= y2-y1     -4 - (-6)       2            1
      -------- = ----------- =  --- / 2 =   --- 
      x2-x1      50 - 30      20          10