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f(1) = -1
f(5) = 7
saat x = 1
p + q = -1
saat x = 5
5p + q = 7
eliminasi q dari 2 persamaan di atas:
p + q = -1
5p+q = 7 (-)
----------------
-4p = -8
p = 2
subtitusi p = 2
p + q = -1
2 + q = -1
q = -3
maka rumus fungsinya:
f(x) = px + q
f(x) = 2x - 3
b. rumus fungsi=2x-3