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Kelas 8 Matematika
Bab Fungsi

16] f(x) = ax + 5

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

f(x) = 2x + 5

f(2) = 2 . 2 + 5
f(2) = 4 + 5
f(2) = 9

17] f(x) = -3x + 6

x = 0
f(0) = -3 . 0 + 6
f(0) = 6

(0, 6)

y = 0

-3x + 6 = 0
-3x = -6
x = -6/-3
x = 2

(2, 0)

✩✩ A ✩✩