book Maths Puzzle Numerical Ability

Hi could you please help me with this problem?
Use inverse matrix to Solve Linear System
3x + y= 5
5x +2y =9

Thank you so much for your time.

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book Other Question

Solve (q+4)(3q-15)= 0 please help me solve the following square root of 2/3 * squareroot 8/12