Persamaan garis lurus yang melalui titik (4,-3) dan (-4,3) adalah......

( y - y1 ) / ( y2 - y1 ) = ( x - X1 ) / ( x2 - X1 )
( y + 3 ) / ( 3 + 3 ) = ( x - 4 ) / ( - 4 - 4 )
( y + 3 ) / 6 = ( x - 4 ) / - 8
- 8 ( y + 3 ) = 6 ( x - 4 )
- 8y - 24 = 6x - 24
- 8y + 6x = - 24 + 24
- 8y + 6x = 0
8y - 6x = 0
disederhanakan
4y - 3x = 0