The train at an amusement park is a scale model of a full size train. A measure of 0.15 meter on the train at the amusement park represents 1 meter on the full size train. The train at the amusement park is 21 meters long what is the length of the full size train in meters

y=mx+b

step-by-step explanation:

m is slope, b is y-intercept

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