# How to determine supply and demand equilibrium equations

Let us suppose we have two simple supply and demand equations

• Qd = 20 – 2P
• Qs = -10 + 2P

To find where QS = Qd we put the two equations together

• 20-2P = -10 + 2P
• 20+10= 4P
• 30/4=P
• P = 7.5

To find Q, we just put this value of P into one of the equations

• Q = 20 – (2×7.5)
• Q= 5

 Qd   = 20 – 2P Qs = -10 + 2P P Qd QS 0 20 -10 1 18 -8 2 16 -6 3 14 -4 4 12 -2 5 10 0 6 8 2 7 6 4 7.5 5 5 8 4 6 9 2 8 10 0 10 11 -2 12 12 -4 14

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