pump B alone fills a tank in 9 hours. pump C takes 15 hours to fill the same tank alone. If pump A, B and C are used, the tank fills in 5 hours. How long does it take pump A to fill a tank alone?

be more specific

step-by-step explanation:

y = 3x+4

step-by-step explanation:

to find the slope

slope = (y2-y1)/ (x2-x1)

    = (-8-4)/ (-4-0)

    = -12/-4

  = 3

using the slope intercept form of a line

y= mx+b

we know the slope is 3

we know the y intercept is 4 ( the point where it crosses the y axis or x=0)

y = 3x+4