SOLUTION: you can order 10 shirts for $60 from a certain mail order company. From that same company you can get 20 shirts for $100. I cant find the expression! i know its in y=mx+b format b

Question 870721: you can order 10 shirts for $60 from a certain mail order company. From that same company you can get 20 shirts for $100. I cant find the expression! i know its in y=mx+b format but i cant figure it out.
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Solve for and
1.
2.
Subtract eq. 1 from eq. 2,

Now user either equation to solve for

.
.
.

where is the number of shirts, is your cost.

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