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2y + 7x = 2 x (-4) + 7 x 1
2y + 7x = -8 + 7
2y + 7x = -1
2y + 7x + 1 = 0
tegak lurus menjadi -7/2
persamaan garis :
y-y₁ = m(x-x₁)
y-1 = -7/2 (x+4)
2(y-1) = -7 (x+4)
2y-2 = -7x-28
7x+2y-2+28 = 0
7x+2y+26 = 0