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2y + 2= -7/4x + 49
2y= -7/4x + 49 - 2
2y= -7/4x + 47
8y= -7x + 188
y= -7/8
tegak lurus, maka :
m1 x m2= -1
-7/8 x m2= -1
m2= -1 : -7/8
m2= -1 x -8/7
m2= 8/7
melalui titik (-2,-3)
x1= -2 y1= -3
y-y1= m2(x-x1)
y-(-3)= 8/7(x-(-2)
y+3= 8/7(x+2)
y+3= 8/7x+16/7
y= 8/7x + 16/7-3
7y= 7x + 16 - 21
7y= 7x - 5
atau
7x - 7y- 5 0.
2y+2=-7/4x+49/4
2y=-7/4x+49-2
2y=-7/4x+47
8y=-7x +47
y=-7/8x+47
m=-7/8
karena tegak lurus maka :
m1×m2=-1
-7/8×m2=-1
m2=8/7
menentukan persamaan garis yang sudah diketahui gradien nya
y-y1=m (x-x1)
y-(-3)=8/7(x-(-2))
y+3=8/7(x+2)
7y+21=8x+16
-8x+7y+5=0
atau 7y=8x-5
maaf jawaban telat,