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1) y = - 2x + 3
m = - 2
sejajar m1 = m2 = - 2
y - y1 = m(x - X1)
y - 3 = - 2 (x - 2)
y = - 2x + 4 + 3
y + 2x = 7

2) x - 2y = 5
- 2y = - x + 5
m = - 1/-2 = ½
sejajar m1 = m2
y - y1 = m (x - X1)
y + 1 = ½ (x - 3)
y = ½ x - ³/2 - 1
y - ½x = - 5/2 (dikalikan 2 utk menghilangkan penyebut)
2y - x = - 5

3) - 2x + 3y = 6
3y = 2x + 6
m = ⅔
tegak lurus
m1 . m2 = - 1
⅔ . m2 = - 1
m2 = - ³/2
y - y1 = m (x - X1)
y - 1 = - 3/2 (x - 2)
y = - 3/2 x + 3 + 1
y + 3/2 x = 4 (dikalikan 2 utk menghilangkan penyebut)
2y + 3x = 8

4) y = - ¼ x + 5
m = - ¼
tegak lurus
m1 . m2 = - 1
- ¼ . m2 = - 1
m2 = - 1 / - ¼ = 4
y - y1 = m (x - X1)
y - 1 = 4 (x - 3)
y = 4x - 12 + 1
y - 4x = - 11