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x1= -2
y1= 5
y-y1= m2 (x-x1)
y-5= 3(x-(-2)
y-5= 3(x+2)
y-5= 3x+6
y= 3x+6+5
y= 3x+11
atau
3x-y+11=0
2. titik (2,1) dan (-2,7)
x1=2 y1= 1
x2= -2 y2= 7
y-y1 x-x1
___ = _____
y2-y1 x2-x1
y-1 x-2
____ = ____
7-1 -2-2
y-1 x-2
___ = ____ (perkalian silang)
6 -4
-4(y-1)= 6(x-2)
-4y+4= 6x-12
-4y= 6x-12-4
-4y= 6x-16
y= 6/-4x- 16/-4
y= -3/2x + 4 |dikali 2|
2y= -3x+8
atau
-3x-2y+8=0
atau
3x+2y-8=0
y-5=3(x-(-2)
y-5= 3x+6
y=3x+6+5
y=3x+11
2. m= y2-y1/x2-x1
= 7-1/-2-2= 6/-4
y-y1= m(x-x1)
y-1=6/-4(x-2)
_____________ x (-4)
-4y+4= 6x-12
-4y= 6x-12-4
-4y= 6x-16
maaf kalau salah