tolongg pleasee yg dibuletinn

19) y - y1 = m ( x - x1)
y + 6 = 3 ( x + 1)
y = 3x + 1 - 6
y = 3x - 5

18) ( y - y1) / ( y2 - y1) = ( x - x1) / ( x2 - x1)
( y + 5 ) / ( 2 + 5) = ( x - 1) / ( 3 - 1)
( y + 5) / 7 = ( x - 1) / 2
2( y + 5) = 7 ( x - 1)
2y + 10 = 7x - 7
2y - 7x = - 7 - 10
2y - 7x = - 17 ( dikali (-) )
7x - 2y = 17