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kemiringan = gradien,
maka :
y - b = m(x - a)
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nomor 1
y - 1 = 2/3(x - 1)
y - 1 = 2/3x - 2/3
kalikan 3
3y - 3 = 2x - 2
3y = 2x - 2 + 3
3y = 2x + 1
kita tahu bahwa garis melalui (1, 1), maka uji di titik lain.
misal x = 0
3y = 2(0) + 1
3y = 1
y = 1/3
jadi, garis melalui (1, 1) dan (0, 1/3)
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nomor 2
y - (-5) = 3(x - 0)
y + 5 = 3x
y = 3x - 5
kita tahu garis melalui (0, -5), maka uji nilai x di titik yang lain.
misal x = 1
y = 3(1) - 5
y = 3 - 5
y = -2
= (1, -2)
jadi, garis melalui titik (0, -5) dan (1, -2)
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nomor 3
y - 2 = 0(x -(-2))
y - 2 = 0
y = 2
garis sejajar dengan sumbu x di y = 2