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Kelas 8 MatematikaBab Persamaan Garis
1] ax + by = c, tegak lurus, (p, q)
bx - ay = bp - aq
3y = -x + 2
x + 3y = 2, tegak lurus, (2, 1)
3x - y = 3 . 2 - 1 . 1
3x - y = 6 - 1
y = 3x - 5
✩✩ B ✩✩
2]
2x - 5y = 2 → dikali 2 → 4x - 10y = 4
5x + 2y = 34 → dikali 5 → 25x + 10y = 170
25x + 10y = 170
..4x - 10y = 4
------------------------ +
29x = 174
x = 174/29
x = 6
✩✩ C ✩✩