When an object falls due to gravity on Earth, the acceleration is 9.8 m/s. A student drops a rock
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1. sum of numbers is x+y=67, the difference between them is x-y=11
2. it is possible to make up and resolve the system:
1. sum of numbers is x+y=67, the difference between them is x-y=11
2. it is possible to make up and resolve the system: