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m=-4-5/-1-2=-9/-3=3
masukkan x=2
y=3.2+c=5
c=-1
maka persamaan garis=
y=3x-1
x₁ = 2
x₂ = -1
y₁ = 5
y₂ = -4
→ mencari gradien (m)
karena sejajar, maka m₁ = m₂, jadi
m₁ = m₂
½ = m₂
m₂ = ½
→ masukkan nilai gradien ke dalam rumus persamaan garis.
y - y₁ = m (x - x₁)
y - 5 = ½ (x - 2)
y - 5 = ½x - 1
y = ½x - 1 + 5
y = ½x + 4 atau ½x - y + 4 = 0