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* f(-2) = 14
14 = a . -2 + b
14 = -2a + b
*f(3) = -1
-1 = a. 3 +b
-1 = 3a +b
Eliminasi :
14 = -2a + b
-1 = 3a + b -
15 = -5a
-3 = a
Substitusi :
-1 = 3a +b
-1 = 3.-3 +b
-1 = -9 + b
8 = b
f(-2) = 14 dan f(3) = -1
f(-2) = a(-2) + b f(3) = a(3) + b = -1
= -2a + b = 14 = 3a + b = -1
di eliminasi ya
-2a + b =14 di subtitusikan
3a + b =-1 -2a + b = 14
dikurangi -2(-3) + b = 14
-5a = 15 6 + b =14
a =15/-5 b = 14 - 6
a = -3 b = 8
maka nilai a dan b adalah (-3, 8)