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f(3)=>3p+q=-10
f(-2)=>-2p+q=0
5p=-10
p=-2
3(-2)+q=-10
q=-4
f(x)=-2x-4
f(7)=-2(7)-4=-18
16. 4y=-3x+5 => m1=-3/4
m1xm2=-1
-3/4 x m2=-1
m2=4/3
persamaan garis: y-y1=m2(x-x1)
y-2=4/3(x+1)
3y-6=4x+4
4x-3y+10=0
untuk nomor 17 saya belum sepenuhnya mengerti, maaf atas kekurangannya - semoga dapat membantu