Question 38958
Define variable:
x = lot's cost
p = price when sold
Define equations:
3000 = 2p - x
-1500 = p - x
Combine:
{{{2p - x - 3000 = 0}}}
+
{{{-p + x - 1500 = 0}}}
=
{{{p - 4500 = 0}}}
Price when sold is $4,500. Each lot cost him $6000.