tolong dong kak, pakai cara ya kak

1) 4x + 2y = 3
2y = - 4x + 3
m = - 4/2
m = - 2
gradien yg sejajar m1 = m2 = - 2
gradien saling tegak lurus
m1 . m2 = - 1
- 2 . m2 = - 1
m2 = ½
jadi yg benar ( C )

2) i)garis a
y = 2 - 3x/2
y = ( 4 - 3x ) / 2
2y = 4 - 3x
m = - 3/2
ii) garis b
6x - 4y = 7
- 4y = - 6x + 7
m = - 6/-4
m = 3/2
iii) garis c
m = ( y2 - y1) / ( x2 - x1)
m = ( 1 + 1 ) / ( 2 - 5 )
m = 2 / -3
m = - 2/3
iv) garis d
m = ( y2 - y1 ) / ( x2 - x1 )
m = ( 3 - 6 ) / ( 1 - 3)
m = - 3 / -2
m = 3/2
jawabannya = ( D )

3) 2y + 4x - 4 = 0
2y = - 4x + 4
m = - 4/2
m = - 2
gradien tegak lurus
m1 . m2 = - 1
- 2 . m2 = - 1
m2 = - 1/-2
m2 = ½
i) 8x - 6y - 20 = 0
- 6y = - 8x + 20
m = - 8/ - 6
m = 4/3
ii) 3x - 6y - 18 = 0
- 6y = - 3x + 18
m = - 3/-6
m = ½
iii) 2x - 4y - 12 = 0
- 4y = - 2x + 12
m = - 2/-4
m = ½
jadi garis yg tegak lurus adlh garis ii) dan iii) ( C )