exam Maths Puzzle Numerical Ability

HOW CAN I FIND IF THERE ARE INVERSE OF EACH OTHER??

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i need help solving a three variable equation. the two given equations are x+y+z=81 and .078x+.092y+.117z=30.01. thank you so much! find an equation of the line satisfying the given conditions.

parallel to the line 2x+y=3 and through (-2,3)