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[tex] P_{1} [/tex] = 60 : 10
  = Rp 6/kg
[tex] P_{2} [/tex] = Rp 8/kg
[tex] Q_{1} [/tex] = 10 unit
[tex] Q_{2} [/tex] = 6 unit

[tex] \frac{ P - P_{1} }{ P_{2} - P_{1}}[/tex] = [tex] \frac{ Q - Q_{1} }{ Q_{2} - Q_{1}}[/tex]
[tex] \frac{ P - 6}{ 8 - 6}[/tex] = [tex] \frac{ Q - 10 }{ 6 - 10}[/tex]
[tex] \frac{ P - 6 }{2}[/tex] = [tex] \frac{ Q - 10 }{ -4}[/tex]
-4(P - 6) = 2(Q - 10)
-4P + 24 = 2Q - 20
-4P + 24 + 20 = 2Q
        -4P + 44 = 2Q
        -2P + 22 = Q