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

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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) About Me  (Show Source):
You can put this solution on YOUR website!
Solve for m and b
1.60=m%2810%29%2Bb
2.100=m%2820%29%2Bb
Subtract eq. 1 from eq. 2,
100-60=20x%2Bb-10x%2Bb
40=10m
m=4
Now user either equation to solve for b
%2820%29%284%29%2Bb=100
b=20
.
.
.
highlight%28y=4x%2B20%29
where x is the number of shirts, y is your cost.