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m1 * m2 = -1
2x - 5y + 7 =0
-5y = -2x -7
y = 2/5 x -7
maka m1 = 2/5
m1 * m2 = -1
2/5 * m2 = -1
m2 = -5/2
persamaan garis
y-y1 = m(x-x1)
y - 4 = -5/2 ( x +3)
2y - 8 = -5x -15
2y + 5x + 7 = 0
itulah persamaan garisnya
karena tegak lurus jika dikali hasilnya harus -1
m2 = 2/5 x -5/2 = -1
jadi m = -5/2
persamaan garis :
y-4 = -5/2 (x--3)
y-4 = -5/2x -15/2
semuanya dikali 2
2y-8 = -5x -15
2y-8+5x+15=0
2y+5x+7=0
maaf jika salah:)