book Maths Puzzle Numerical Ability

2x-3y=9

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book Other Question

Solve the system of equations. If the system is inconsistent or has dependent equations, say so.

x + 3y + 2z = 11

4y + 9z = -12

x + 7y + 11z = -11
i am stumped i have an answer but it seems way off
0.7x-(6-.5x)=.48
i have the answer as 8.54 but i rounded