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melalui (2,-1) maka:
3(2) + a(-1) - 15 = 0
a = - 9
3x - 9y - 15 = 0
atau
x - 3y = 5
gambarnya lihat pd gambar berikut:
6 - a -15 = 0
a = -9
persamaan garisnya 3x-9y-15=0 dengan gradien (m)
titk potong sumbu x jika y=0 maka x=5 =====>(5,0)
titik potong sumbu y jika x=0 maka y=-5/3 ===> (0,-5/3)
grafik nya dalam file lampiran (word n jpg)