Answer: The unit price is $0.90 per kilogram
4/5×1/2= 2/5.
If you want your answer in decimal form than it would be 0.4.
The equation:

has the form:
y = mx + b
with

m is known as the slope of the line, then the slope is -2/3
(-1,-10)(3,2)
slope = (2 - (-10) / (3 - (-1) = (2 + 10) / (3 + 1) = 12/4 = 3
y = mx + b
slope(m) = 3
(3,2)...x = 3 and y = 2
now we sub and find b, the y int
2 = 3(3) + b
2 = 9 + b
2 - 9 = b
-7 = b
so ur equation is : y = 3x - 7 or f(x) = 3x - 7