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dan garis 3x + 5y = 15
a= 3 b= 5 c= 15
maka : m = -a/b
m = -3/5
lalu :
y-b = m(x-a)
y-3 = -3/5 (x-2)
y-3 = -3/5x +6/5
y+3/5x= +6/5 +3
y+ 3/5x = 21/5 persamaan dikali 5
5y + 3x = 21
maka gradien (m1) = -3/5
karena sejajar maka m1=m2 --> m2= -3/5
titik A(2,3) --> (x1,y1)
persamaan garis menjadi:
y-y1=m2(x-x1)
y-3 = -3/5(x-2)
y-3 = -3/5x+6/5
______________ x5
5y-15=-3x+6
3x+5y-15-6=0
3x+5y-21 =0
maaf kalo salah