Answer:
y = 125x + 775
Explanation:
you can make coordinate points (x, y) from the graph
x = Number of hours
y = Total Charge
(1, 800) and (2, 925)
slope from 2 points = y2-y1/x2-x1
x1 = 1
y1 = 800
x2 = 2
y2 = 925
925 - 800/2-1 = 125/1
m = 125
using y = mx + b, where m = 125, and 1 of the coordinate points you can find the y intercept
multiply 125 times 2
925 = 250 + b
subtract 250 from both sides
b = 675
y = 125x + 675