yang nomor 4 nya ya.tolong di bantu kak

a) y - y1 = m ( x - X1)
y - 4 = - ⅓ ( x - 0 )
y = - ⅓ x + 4 ( dikali 3)
3y = - x + 12
3y + x = 12

b) y - y1 = m ( x - X1)
y + 2 = - 4 ( x - 1 )
y = - 4x + 4 - 2
y + 4x = 2

c) ( y - y1 ) / ( y2 - y1 ) = ( x - X1 ) / ( x2 - X1 )
( y - 6 ) / ( 4 - 6 ) = ( x - 1) / ( 7 - 1)
( y - 6 ) / ( - 2) = ( x - 1 ) / 6
6 ( y - 6 ) = (-2) ( x - 1 )
6y - 36 = - 2x + 2
6y + 2x = 2 + 36
6y + 2x = 38 ( disederhanakan)
3y + x = 16

d) y = x - 6
m = 1
sejajar m1 = m2 = 1
pers garis
y - y1 = m ( x - X1)
y + 1 = 1 ( x + 2)
y = x + 2 - 1
y = x + 1

g) m = ( y2 - y1 ) / ( x2 - X1 )
m = ( - 2 + 4 ) / ( 0 + 5 )
m = 2 / 5
gradien saling tegak lurus
m1 . m2 = - 1
2/5 . m2 = - 1
m2 = - 1 ÷ 2/5
m2 = - 5/2
pers garis
y - y1 = m ( x - X1)
y + 4 = - 5/2 ( x + 5)
y = - 5/2 x - 25/2 - 4 ( dikali 2)
2y = - 5x - 25 - 8
2y + 5x = - 33