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2x-5y = 8
a=-5
b=2
gradien = m = -b/a = -2/-5 = 2/5
karena sejajar, artinya
m1 = m = 2/5
(7,2) ------> x1=7 y1=2
y-y1 = m1(x-x1)
y-2 = 2/5(x-7)
kalikan semua dengan 5 didapat
5y-10 = 2(x-7)
5y-10 = 2x-14
5y-2x = -14+10
5y-2x = -4