Suppose you are saving money for a new cell phone. At week 0 you have $20 and at week 10 you have $100. If y represents the amount of money you have saved and x represents the number of weeks, find and interpret the slope of the linear equation. HELP , pleaseee?

1/8; $8 is put away each week.
10; $10 is put away each week.
8; $8 is put away each week.
1/10; $10 is put away each week.

Question

Suppose you are saving money for a new cell phone. At week 0 you have $20 and at week 10 you have $100. If y represents the amount of money you have saved and x represents the number of weeks, find and interpret the slope of the linear equation. HELP , pleaseee?

1/8;  $8 is put away each week.
10; $10 is put away each week.
8; $8 is put away each week.
1/10; $10 is put away each week.

hero · Answer

The  1st point is (x,y) = (0,20)
The 2nd point is (x,y) = (10,100)

Which means now you can simply use y = mx + b to solve:

20 = 0m + b
100 = 10m + b

Isolating and solving for b you get:

b = 20
b = 100 - 10m

Next set b = b

100 - 10m = 20

Afterwards isolate and solve for m to get:
100 - 20 = 10m
80 = 10m
80/10 = m
8/1 = m

in this case, y/x = m means money/week

hero · Answer

So what is the answer @andreascott

anonymous · Answer

well 8 divided by 1 is 8 . So, its the third one? Right ?