exam Maths Puzzle Numerical Ability

Solve the following matrix
[ 2 8 22 ]
[ 4 1 14 ]
I think you need to multiply the top by negative 2 and then subtract from the bottom. but I am confused from there.

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exam Other Question

What is the solution? 5x+12=3x-6 A survey of 700 people was conducted. Forty percent of the men surveyed supported the issue in question, while 70 percent of the women supported it. A total of 400 supported the issue. How many more women than men were surveyed?