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f(2) = 13
f(4) = 19
Jawab :
13 = 2a + s
19 = 4a + s
dieliminasi / dikurang,menjadi
-6 = -2a
-6 : 2 = a
-3 = a
13 = 2a + s
13 = 2.(-3) + s
13 = -6 + s
13 + 6 = s
19 = s
Rumus fungsi => f(x) = ax + s
f(x) = -3x + 19
ps : maaf kalau salah
f(2) = 13
f(4) = 19
nilai a & b?
f(2) = a(2) + s = 13
f(4) = a(4) + s = 19
2a + s = 13
4a + s = 19
Dieliminasi(disebut dengan dikurang) menjadi
-2a = -6
a = -6 : 2
a = -3
b =
(ambil salah satu persamaan diatas mau yg mana saja hasilnya pasti sama)
2a + s = 13
2(-3) + s = 13
-6 + s = 13
s = 13 + 6
s = 19
a = -3
b = 19
jadi bila ditulis dalam bentuk rumus = -3x + 19