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maka, m(gradien) = -7
y -y₁ = m(x -x₁)
y -(-2) = -7(x -3)
y +2 = -7x +21
y = -7x +21 -2
y = -7x +19
7x +y -19 = 0
y+2=-7(x-3)
y=-7x+21-2
y=-7x+19