exam Maths Puzzle Numerical Ability

Caridad is six years older than her sister. Four years ago she was 4 times as old as her sister. how old Caridad.

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Hello. Can you please help me with this? I need to complete the given pairs so that each ordered pair satisfies the given equation.

x+2y=1 (0, ) (-2, ) (2, )

I appreciate your help and thank you so much in advance. If AC=BD,then AB=CD what property is this