two markets for substitute goods:
Qs1 = 2P1
QS2=-10+2P2
QD1=20-P1+P2
QD2=40-2P2+P1
FIND THE EQUILIBRIUM PRICE AND QUANTITY OF THE TWO GOODS
"Q_s=Q_d,"
"2P_1=20-P_1+P_2,"
"-10+2P_2=40-2P_2+P_1,"
"P_1=130\/11,"
"P_2=170\/11,"
"Q_1=260\/11,"
"Q_2=230\/11."
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