M = \begin{bmatrix} a & b \\ c & 0 \\ \end{bmatrix}
with $a + b - 2c = 0$
Show that M is a subspace from $M_{2:2} (\mathbb{R})$
[$M_{2:2} (\mathbb{R})$ is the ring of 2 \times 2 matrices over the real numbers]
can someone help me?
M = \begin{bmatrix} a & b \\ c & 0 \\ \end{bmatrix}
with $a + b - 2c = 0$
Show that M is a subspace from $M_{2:2} (\mathbb{R})$
[$M_{2:2} (\mathbb{R})$ is the ring of 2 \times 2 matrices over the real numbers]
can someone help me?