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Verified answer
Materi : Persamaan GarisTingkat : VIII SMP
Titik (7,4) ---> x1 = 7 , y1 = 4
Garis 4y - x - 9 = 0
m1 = -a / b
m1 = -(-1) / (4)
m1 = 1/4
Syarat tegak lurus --> m1 x m2 = -1
m1 x m2 = -1
1/4 x m2 = -1
m2 = -4
Persamaan garisnya
y - y1 = m2 (x - x1)
y - 4 = -4 (x - 7)
y - 4 = -4x + 28
y = - 4x + 28 + 4
y = -4x + 32
atau
y - 4 = -4x + 28
4x + y - 4 - 28 = 0
4x + y - 32 = 0