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Verified answer
Kemiringan garis=gradien=mm=y1-y2/x1-x2
-¼=h-7/4-(h+3)
-¼=h-7/-h+1
4(h-7)=-1(-h+1)
4h-28=h-1
4h-h=-1+28
3h=27
h=27/3=9