9514 1404 393
Answer:
C = 9x +2280
Step-by-step explanation:
The 2-point form of the equation for a line can be a place to start.
y = (y2 -y1)/(x2 -x1)(x -x1) +y1
C = (4800 -3000)/(280 -80)(x -80) +3000 . . . . . use given values
C = 1800/200(x -80) +3000 . . . . simplify some
C = 9x -720 +3000 . . . . eliminate parentheses
8.64 - 3.15 = $5.49 if this is what you are asking
Answer: 18.7
Find the lengths of AB, BC, and CA
AB = = 5 ≈ 7.1
BC = = 5 ≈ 7.1
CA = = 2 ≈ 4.5
7.1 + 7.1 + 4.5 = 18.7
A) y = -5/8x + 6
y2 - y`1 / x2 - x1
7/2 - 11 / 4 - (-8)
-15/2 / 12
= -5/8
y = -5/8x + b
11 = -5/8(-8) + b
11 = 5 + b
6 = b