exam Maths Puzzle Numerical Ability

i came from aschool that did not teach math real well and i am really struggling with linear equations. so can you please tell me if x=9 is a linear equation.

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exam Other Question

A building has a market value of $229,000.00. If it is assessed at 50% of market value and the tax rate is 40 mills, find the property tax. Help with this matrix would be much appreciated!

find and write the linear system corresponding to matrix and solve it

[1 0 0 | 7 ]
[0 1 0 | -3 ]
[0 0 2 | 6 ]