f(x)=ax+7 jika f(3)=1,maka nilai f(1)adalah

Kelas 8 Matematika
Bab Fungsi

f(x) = ax + 7

f(3) = 1
3a + 7 = 1
3a = 1 - 7
a = -6/3
a = -2

f(x) = -2x + 7

f(1) = -2 . 1 + 7
f(1) = -2 + 7
f(1) = 5

f(x)=ax+7
f(3) = 3a + 7 = 1
= 3a = -6
= a = -2
f(1) = -2×1 + 7 = 5