bantuin doang pake cara tpi jngn ngasal ya pliss

10) 4x + 2y - 8 = 0
2y = - 4x + 8
m = - 4/2
m = - 2
sejajar m1 = m2 = - 2
Pers garis
y - y1 = m ( x - X1)
y + 5 = - 2 ( x - 0)
y = - 2x - 5 ( B )

12) y = 3x - 1
m = 3
sejajar m1 = m2 = 3
m = ( y2 - y1) / ( x2 - X1)
3 = ( 1 - (2k - 1)) / ( 3 - 5)
3 = ( 1 + 1 - 2k ) / (-2)
3 × (-2) = 2 - 2k
- 6 = 2 - 2k
- 6 - 2 = - 2k
- 8 = - 2k
k = (-8) ÷ (-2)
k = 4 ( B )

18) 2x - y = 6
- y = - 2x + 6
m = - 2/-1
m = 2
gradien tegak lurus
m1 . m2 = - 1
2 . m2 = - 1
m2 = - 1/2 ( A )