Question

Please help?

Answer 1

find slope using the points (75, 410) and (230, 999)

m = (999 - 410)/(230 - 75)

so the slope of the line is m = 3.8 or m = 19/5

so next pic a point and substitute into

y = 3.8x + b

to find the cost intercept...

say x = 75 and y = 410

so

410 = 3.8*75 + b

just solve for b

Answer 2

b=125

Answer 3

that correct so the equation is

C = 3.8x + 125

Answer 4

oops should be

C = 3.8n + 125