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f(2) = 13
2a+b = 13 ---> b=13-2a
f(5) = 22
5a+b = 22
5a+13-2a = 22
3a = 22-13
3a = 9
a = 3
b = 13-2a
b = 13-2(3)
b = 13-6
b = 7
A. a=3, b=7
B.
f(x) = ax+b
f(x) = 3x+7
C.
f(10) = 3(10)+7
= 30+7
= 37