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m₁ = -3/5
Gradien garis kedua: sejajar
m₂ = m₁ = -3/5
Persamaan garis dengan m=-3/5 melalui (2,3)
y - y₁ = m (x - x₁)
y - 3 = -3/5 (x - 2)
5(y-3)= -3(x-2)
5y-15 = -3x + 6
5y = -3x + 6 + 15
5y = -3x + 21
3x+5y= 21