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2y = 6x + 12
m = 6 : 2 = 3
y - y₁ = m(x - x₁)
y + 12 = 3(x + 18)
y + 12 = 3x + 54
3x - y = - 42
2)
maksudnya 8y = 6x + 16 bukan? kalau iya..
m = 6/8 = 3/4
karena tegak lurus maka:
m₂ x m₁ = -1
m₂ x 3/4 = -1
m₂ = - 4/3
y - y₁ = m (x - x₁)
y + 18 = -4/3(x - 12)
---------------------------- x3
3y + 54 = -4(x - 12)
3y + 54 = -4x + 48
4x + 3y = - 6
Maaf kalau kurang teliti^^
gradien = -a/b = -6/2 = -3.
y -y1 = m(x-x1)
y-(-12)=-3(x-(-18))
y+12=-3(x+18)
y+12=-3x+54
3x-y=54-12
3x-y=42.
2. 8c=6x+16
gradien=-a/b=-6/8 tegak lurus 8/6 atau 4/3.
y-y1=m(x-x1)
y-(-18)=4/3(x-12)
y+18=4/3(x-12)
3(y+18)=4(x-12)
3y+54=4x-48
-4x+3y=-102 atau
4x+3y=6.
maaf agak keliru jawabannya