SOLUTION: You are a manufacturer of a certain type of watch. You’ve calculated that it costs $600 to make 35 watches and $715 to make 50 watches. Assuming this relationship is linear,

Algebra ->  Linear-equations -> SOLUTION: You are a manufacturer of a certain type of watch. You’ve calculated that it costs $600 to make 35 watches and $715 to make 50 watches. Assuming this relationship is linear,       Log On


   



Question 329428: You are a manufacturer of a certain type of watch. You’ve calculated that it costs $600 to make 35 watches and $715 to make 50 watches.
Assuming this relationship is linear, write an equation that relates cost to the number of watches you make.

Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Find the slope.
m=%28715-600%29%2F%2850-35%29=115%2F15=23%2F3
C=%2823%2F3%29W%2Bb
Use either point to solve for b.
600=%2823%2F3%29%2835%29%2Bb
b=1800%2F3-805%2F3
b=995%2F3
highlight%28C=%2823%2F3%29W%2B%28995%2F3%29%29 where W is the number of watches,C is the cost.