exam Maths Puzzle Numerical Ability

solve each system by elimination. check your answers.

-x-y-2z=4
-x+2y+z=1
-x+y-3z=11

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exam Other Question

give a counterexample that demonstrates that the converse of the statement is false:
If an angle measures 94 degrees, then it is obtuse. Solve the system by graphing.
3x + y = -1
9x + 3y = -3

Please help me graph and solve this graphing system, I am not understanding how to solve these problems. Thanks