Answer:
y = 10.50x + 7.50
Step-by-step explanation:
First find the slope
m = ( y2-y1)/(x2-x1)
Add the two y values to get the total y for the slope
y2 = 5.50+4 = 9.50 when x=2
y1 = 3.50+ 2.50 = 6 when x =1
m = ( 9.50-6/(2-1)
3.50/1
= 3.50
The slope intercept form is
y = mx+b where m is the slope and b is the y intercept
y = 3.50x +b
Using the point ( 1,6)
6 = 3.50(1) + b
6 - 3.50 = 3.50+b-3.50
2.50 =b
y = 3.50x+2.50
We want 3 shipments
Multiply by 3
y = 10.50x + 7.50
