What does this picture have to do with matrices?

Matrix

A little warm up ...

Matrices and multiplication... this is called "scalar multiplication" or "multiplication by a scalar".

Now you try ...

Now put it all together ...

Now put it all together ...

Now put it all together ...

HOMEWORKSolve for x:

Solve:

Solve for x:

Solve for x:

Solve:

Solve: