bantu gan tentang lersamaaan garis yg sejajar, gradien dlll no25 smpai 30 kalsu ga bisa gpp seterah mau isi yg mana pake cara ya jgn sembarangan! yg sembarangan

25) 5y = 4
gradien tdk mempunyai ( C )

26) m = ( y2 - y1 ) / ( x2 - x1 )
m = ( 9 - 17 ) / ( 2 - 4 )
m = - 8 / - 2
m = 4 ( D )

27) y - y1 = m ( x - x1 )
y - 7 = 3 ( x - 6 )
y = 3x - 18 + 7
y = 3x - 11 ( A )

28) m = ( y2 - y1 ) / ( x2 - x1 )
m = ( - 1 + 2 ) / ( 3 - 1 )
m = 1 / 2
subtitusi ke salah satu titik
y - y1 = m ( x - x1 )
y + 2 = ½ ( x - 1 )
y = ½ x - ½ - 2 ( dikalikan 2)
2y = x - 1 - 4
2y = x - 5 ( B )

29) y1 = y2
x + 4 = 2x + 8
x - 2x = 8 - 4
- x = 4
x = - 4
subtitusi ke pers
y = x + 4
y = - 4 + 4
y = 0
ttk potong ( - 4 , 0 ) ( A )

30) y1 = y2
3x + 3 = 2x + 5
3x - 2x = 5 - 3
x = 2
subtitusi ke pers
y = 3x + 3
y = 3(2) + 3
y = 6 + 3
y = 9
ttk potong ( 2 , 9) ( A )