Cara ngerjainnya gimana? Grafik fungsi

f(x) = y = |ax + b|

Lihat gambar
• (-3,0)
f(-3) = 0
a.(-3) + b = 0
-3a + b = 0
b = 3a ... (1)

• (0,3)
f(0) = 3
a.0 + b = 3
b = 3 --> a = b/3 = 1

Jadi grafik diatas, memenuhi utk
f(x) = |ax + b|
f(x) = |x + 3|