exam Maths Puzzle Numerical Ability

PROBLEM:
FOR A FUNDRAISING ACTIVTIY, A CHARITABLE ORGANIZATION PRODUCES COOKBOOKS TO SELL IN THE COMMUNITY. THE PROFIT, p (IN DOLLARS), DEPENDS ON THE NUMBER OF COOKBOOKS PRODUCED

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exam Other Question

x-1 divided by x+1 + x+7 divided by x-1 = 4 divided by x^2-1

and

2x+3 divided by 3x-2 = 4x+1 divided by 6x+1

Thank you!
Chapter:The Elimination Method
2x+3y=2
3x-4y=16