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f(a) = -17
-17 = 4x-5
4x = -12
x = -3
f(x) = ax+b
f(4) = 11
f(-3) = -3
f(10) =
-3 = -3a + b
b = -3+3a
11= 4a+b
11 = 4a -3+3a
11 = 7a-3
7a = 14
a = 2
b = -3+3.2
b = 3
f(10) = 2.10+3
f(10) = 23