15-17 ︎ ︎ ︎ ︎ ︎ ︎ ︎ ︎ ︎​​

15) f(x) = -x -1

masukkan x=1

f(1) = -1-1= –2

diperoleh (1,-2)

masukkan x=2

f(2)= -2-1 = –3

diperoleh (2,-3)

jadi, gambar B adalah jawaban benar.

16) f(x)= -½x +1

5 = -½ a +1

5-1 = -½ a

4(-2) = a

a = -8

17) f(x) = -½x+5

f(4)= -2+5= 3

f(6)= -3+5= 2

——-_

1

jadi, f(4)-f(6)= 1

________

semangat belajar…..