exam Maths Puzzle Numerical Ability

what is domain and range

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exam Other Question

solve using the addition method,answer must be an ordered pair.
-2x=2y+5
6x+3y=3 jim is now three times as old as kathy.
Four years ago, jim was seven times as old as kathy then.
find their present ages.

PLEASE HELP ME SOLVE THIS!

and can you show work!