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f(x) = px - q
f(-5) = 14
f(7) = 26
Ditanya :
nilai p dan q
jawab :
f(x) = px - q
f(-5) = p(-5) - q
14 = -5p - q
f(7) = p × 7 - q
26 = 7p - q
eliminasi :
14 = -5p - q
26 = 7p - q
------------------- -
12 = -12p
1 = p
subtitusi :
-5p - q = 14
-5(1) - q= 14
-5 - q = 14
-q = 14 + 5
-q = 19
q = -19