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-51 = 7a - 16
-35 =7a
a = -35 / 7
a = -5
2) f(x) = ax +b
f(2) = a2 + b = 8
f(8) = a8+ b = 44
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-a6 = - 36
a = 6
a2 +b = 8
6 x 2 + b =8
12 +b =8
b = -4