tolongg donggg yg dibuletin

3) m = ( y2 - y1 ) / ( x2 - X1)
m = ( - 5 - 4 ) / ( 2 - 1)
m = - 9 / 1
m = - 9 ( A )

4) m = ( y2 - y1 ) / ( x2 - X1)
m = ( - 3 - 1 ) / ( 2 + 3)
m = - 4/5 ( C )

5) y = - 2x + 6
m = x / y
m = - 2 / 1
m = - 2 ( C )

6) 3y = 6x - 5
m = x/y
m = 6/3
m = 2 ( C )

7) 2x - 6y - 9 = 0
-6y = - 2x + 9
m = x/y
m = - 2/ - 6
m = ⅓ ( C )

8) x = 3y - 4
- 3y = - x - 4
m = x/y
m = - 1 / - 3
m = ⅓
sejajar m1 = m2
ma = ⅓ ( B )

9) x + 2y - 10 = 0
2y = - x + 10
m = - 1/2
gradien tegak lurus
m1 . m2 = - 1
- ½ . m2 = - 1
m2 = - 1 ÷ - ½
m2 = 2 ( D )

10) 3x - y + 2 = 0
- y = - 3x - 2
m = x/y
m = - 3/ - 1
m = 3
gradien tegak lurus
m1 . m2 = - 1
3 . m2 = - 1
m2 = - ⅓ ( C )