Brenna charges $15, $30, $45, and $60 for babystting 1,2,3, and 4 hours, respctively. is the relastionship between the amount charge and the number of hours porportional? if so, find the unit rate. if not explain why

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