f (x)=ax+b dik = f (1) =5 dan f (-3) = 11 dit = nilai a dan b berturut - turut adalah

Bab Fungsi
Matematika SMP Kelas VIII

f(x) = ax + b

f(1)  =    a + b =  5
f(-3) = -3a + b = 11
        --------------------- -
              4a = -6
                a = -6/4
                a = -3/2

a + b = 5
-3/2 + b = 5
b = 5 + 3/2
b = 5 3/2
b = 13/2

jadi, a = -3/2 dan b = 13/2

f(x) = ax + b

f(1) = a + b = 5
f(-3) = -3a + b = 11
________________-
4a = -6
a = -3/2

a + b = 5
-3/2 + b = 5
b = 5 3/2
b = 6 1/2

coba cek lg