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Titik yang dilalui grafik : (-1,1) (0,3) (1,5) (2,7).
f(x) = ax + b.
f(0) = 0a + b = 3
b = 3
f(1) = 1a + b = 5
1a + 3 = 5
a = 5 - 3
a = 2.
Rumus Fungsinya adalah f(x) = 2x + 3.
Nomor 22 :
t = √(2,5² - 2²)
t = √(6,25 - 4)
t = √2,25
t = 1,5
Gradiennya= t/a = 1,5/2 = 3/4