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f(3 ) => 3p + q = -1 _
-5p = 15
p = 15/-5
p = -3
subtitusikan
3p + q = -1
3(-3) +q = -1
-9 + q = -1
q = -1+9
q = 8
ilai dari
f(7) = -3(7) + 8
= -21 + 8
= - 13
jawabnnya A