<PRE><B>Question 180188</B>
A home-made lefsa enterprise estimates that they can sell 30 dozen lefsa at $3.00 per dozen and 25 dozen lefsa at $4.00 per dozen. write a linear equation for the amount of lefsa sold in terms of the price per dozen. use your equation to approximate the amount of lefsa sold at $5.00 per dozen. 
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You have two points of the form (price,lefsa)
They have (3,30) and (4,25)
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m = (25-30)/(4-3) = -5
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You have m=-5 and y = 25 when x = 4; solve for b in the form y = mx + b
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25 = -5*4 + b
b = 45
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lefsa(in dozens) = -5(price) + 45

lefsa($5) = -5*5 + 45
lefsa($5) = 20 dozen
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Cheers,
Stan H.</PRE>