exam Maths Puzzle Numerical Ability

solve the linear system using elimination

1/4x-2/3y=7
1/2x+2/3y=-4

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exam Other Question

Is the squ rt of x (squared) = x an identity (true for all values of x)?
Explain If a clock loses 2 minutes every 15 hours how much times does it lose after 2 hours? Need help on how to solve. Answer is 4/15