Joanne sells silk-screened t-shirts at community festivals and craft fairs. her marginal cost to produce one t-shirt is $ 5.50 . her total cost to produce 70 t-shirts is $ 435 comma and she sells them for $9 each.
a. find the linear cost function for joanne's t-shirt production.
b. how many t-shirts must she produce and sell in order to break even?
c. how many t-shirts must she produce and sell to make a profit of $800?

A-y=4.50x ,4.50 is the slope because for each shirt she sells that is how much she makes and she doesn't have an original value for a y-intercept.

B- 1 ,each tee-shirt she makes she will profit 4.50 for a single so she makes money after the first one.

C-129 ,because you need to find how much each tee-shirt costs in the bunch of 70 and divide it from 800 and round to 129.

Answer Link