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2a+b=3
f(-4) = 27
-4a+b = 27
tinggal eliminasi dan substitusi. jika a dan b sudah di ketahui maka masukkan angka 3. nanti ketemu hasilnya
f(2) = 2a + b = 3
f(-4) = a(-4) + b = 27
f(-4) = -4a + b = 27
*dieleminasikan : (2a + b = 3) - (-4a + b = 27)
6a = -24
a = -24 ÷ 6
a = -4
cara nyari b :
f(2) = -4(2) + b = 3
f(2) = -8 + b = 3
f(2) = b = 3 + 8
b = 11
jadi jika f(3)
f(3) = -4(3) + 11
f(3) = -12 + 11
f(3) = -1