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m1=3,m2= -1 / m1
-1/3
y - y1 = m2 (x - x1),,melewati ttk (6,-1)
y + 1 = -1/3 (x - 6)
y + 1 = -1/3x + 2 (6/3)
y = -1/3x + 2 -1
y = -1/3x + 1 atau x + 3 - 3 = 0
x1= 6 y1= -1
y= 3x + 2
y= 3 atau m1= 3
karena tegk lurus, maka :
m1 × m2= -1
3 × m2= -1
m2= -1/3
y-y1= m2(x-x1)
y-(-1)= -1/3(x-6)
y+1= 1/3x + 2
y= 1/3x + 2 + 1
3y= x + 6 + 3
3y= x + 9
atau
x - 3y + 9= 0
Jadi, persaman garisnya adalah 3y= x + 9 atau x - 3y + 9= 0.