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4x - 2y = -3
-2x + 8y = - 3
..
1)
4x - 2y = -3
-4x +16y = - 6
...(+)...
14 y = -9
y = -9/14
2)
4x - 2y = - 3
-2x + 8y = - 3
..
16x - 8y = - 12
-2x+8y = - 3
..(+)..
14x = - 9
x= -9/14
garis tegaklurus 4x + 8y +2 = 0 melalui (x,y) = (- 9/14, - 9/14)
8x - 4y = 8(-9/14) - 4(-9/14)
8x - 4y = -72/14 + 36/14
8x - 4y = - 36/14
14(8x) - 14(4y) = - 36
14(2x) - 14(y)= - 9
28 x - 14y + 9 = 0