Algebra help?

Question

i just need help on two of my algebra problems please!

Between 1980 and 1990, the number of cable television subscribers increased by about 3600 per year. IN 1987, there were 41,400 cable television subscribers. Find an equation that gives the number, y, of cable television subscribers, in terms of the year, x. let x=0 correspond to 1980.

After 8 weeks on a fitness program, Greg can jog 30 miles a week. His average mileage gain has been 2 miles per week. Find an equation that gives Greg's mileage, m, in terms of the number, n, of weeks that he stays on the program.

i believe they have to be in slope-intercept form? HELP please!

Answer 1

1) m=3600 b=41400 when x = 7 (1987)
y=3600x+b
41400=3600(7)+b
41400= 25200 + b
b = 16200
y = 3600x + 16200 <--answer

2) n/"x"=8, m/"y"=30 slope/"m"=2

30=2*8+b
30=16+b
b = 14
m = 2n + 14

Answer 2

First question:

Start with:
y = 3600x + c

Use info for 1987 to find c:
41400 = 3600(1987 - 1980) + c
c = 16200

So formula is:
y = 3600x + 16200


Second question:

Start with:
n = 2m + c

Use info for 8 weeks at 30 miles to find c:
30 = 2(8) + c
c = 14

So equation is:
n = 2m + 14

Answer 3

sorry kid do your own homework