Answer:
Linear equation for the monthly cost of the cell plan is 
Step-by-step explanation:
Let u denotes a flat monthly fee and v denotes amount charged per minute.
As the monthly cost is $71.50 if a customer uses 410 minutes,
(i)
As the monthly cost is $118 if a customer uses 720 minutes,
(ii)
Subtract (i) from (ii)

Put
in (i)

As x denotes the number of monthly minutes used,
linear equation for the monthly cost of the cell plan is 
Y = -x means y would be the opposite of x
-2 = 2
-1 = 1
0 = 0
1 = -1
2 = -2
Answer:
x = -2
Step-by-step explanation:
- x - = positive
-6 x -2 = 12
Answer:
-2
Step-by-step explanation:
the y-intercept is -2