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Verified answer
A) y = 3x + 5m = 3
tegak lurus
m1 . m2 = - 1
3 . m2 = - 1
m2 = - ⅓
pers garis
y - y1 = m ( x - x1)
y - 7 = - ⅓ ( x + 5 )
y = - ⅓x - 5/3 + 7 ( dikali 3)
3y = - x - 5 + 21
3y + x = 16
b) 7x - 6y + 8 = 0
- 6y = - 7x - 8
m = - 7/-6
m = 7/6
tegak lurus
m1 . m2 = - 1
7/6 . m2 = - 1
m2 = - 6/7
pers garis
y - y1 = m ( x - x1)
y - 2 = - 6/7 ( x - 1)
y = - 6/7 x + 6/7 + 2 ( dikli 7)
7y = - 6x + 6 + 14
7y + 6x = 20