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maka, m = 1
y -y₁ = m(x -x₁)
y -(-1) = 1(x -(-2)
y +2 = x +2
y = x +2 -2
y = x
y=x-6
jadi,m (gradien) adalah 1
kita masukkan ke rumus
y-y1 = m(x-x1)
y-(-1) = 1(x-(-2))
y+1 = 1(x+2)
y+1 = x+2
lalu kita pindah ruas :
0 = x-y+2-1
0 = x-y+1
ini jawaban menurut saya