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f(7) = 7a + b = 16
-5a = -15
a = 3
*f(2) = 2(3) + b = 1 | 6 + b = 1 |
f(7) = 7(3) + b = 16 | 21 + b = 16 +|
27 + 2b = 17
2b = 17-27
b = -10
2
= -5
* a-b = 3-(-5) = 8 (a)
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