exam Maths Puzzle Numerical Ability

give a counterexample that demonstrates that the converse of the statement is false:
If an angle measures 94 degrees, then it is obtuse.

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exam Other Question
I am trying to figure the equation for 3x+4y=12 (0, ),(5, ), (3/4, ),(0, ), (8/3, ) solve each system by elimination. check your answers.


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