Kak jainudin jawab ya soalnya buat lusa
m = Δy/Δx
garis AB
m = -6/3 = -2
melalui titik (-1, -4)
persamaan garis AB
y – y1 = m(x - x1)
y – (-4) = -2(x – (-1))
y + 4 = -2(x + 1)
y + 4 = -2x – 2
y = -2x – 2 – 4
y = -2x – 6
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Garis BC
m = 4/4 = 1
melalui titik (3, 0)
Persamaan garis BC
y – y1 = m(x – x1)
y – 0 = 1(x – 3)
y = x – 3
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Persamaan garis CD
x = 3
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Garis AD
m = 3/7
melalui titik (3, 5)
y – y1 = m(x – x1)
y – 5 = 3/7(x – 3)
7(y – 5) = 3(x – 3)
7y – 35 = 3x – 9
3x – 7y = -35 + 9
3x – 7y = -26