a₁x + b₁y = c₁
a₂x + b₂y = c₂
a₁x + b₁y + c₁z = d₁
a₂x + b₂y + c₂z = d₂
a₃x + b₃y + c₃z = d₃
a₁x + b₁y + c₁z + d₁t = e₁
a₂x + b₂y + c₂z + d₂t = e₂
a₃x + b₃y + c₃z + d₃t = e₃
a₄x + b₄y + c₄z + d₄t = e₄
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