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y-y1 = m (x-x1)
y-2 = 2/5 (x-7) > dikali 5 semua
5y-10=2(x-7)
5y-10=2x-14
5y=2x-4 ( dibagi 5 semua , biar sederhana )
y=2/5x-4/5
2x - 5y = 8
a= 2 b=-5
Rumus = -a/b = -2/-5 = 2/5
maka :
y-b = m(x-a)
y-2 = 2/5(x-7)
y-2 = 2/5x-14/5
y-2/5x = -14/5 + 2
y-2/5x = - 4/5 kali 5
5y-2x = -4