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b = - 2a
f(6)=16 ---- 16 = 6a + b
16 = 6a + (-2a)
16= 4a
a=4
4=3x4 + b ------ b= -8 ----- f(x) = 4x - 8
f(10) = 4x10 - 8
f(10) = 32