Mathematical Science Linear Algebra Vector Spaces

Which of the following is a subspace of the real vector space ℝ3 ?

1
{(x, y, z) ∈ ℝ3 : (y + z)2 + (2x − 3y)2 = 0}
2
{(x, y, z) ∈ ℝ3 : y ∈ ℚ}
3
{(x, y, z) ∈ ℝ3 : yz = 0} 
4
{(x, y, z) ∈ ℝ3 : x + 2y − 3z + 1 = 0}

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