exam Maths Puzzle Numerical Ability

Please help me with this problem. Solve the system of equations.
11.)-3x-y+8z=54
-6x+9y-4z=25
5x-4y+z=-15

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exam Other Question
In the year 1998, there were -4.57 times 10 to the 7th power- cars in America. The population of America was -2.3 times 10 to the 6th power-. What was the average number of cars per person in America in 1998?
A. 0.5
B. 1.98
C. 5
D. 19.8 Find the rate of change for each time period. During which period did the number of swimmers increase at the fastest rate? This table shows the number of sweimmers in the ocean at