exam Maths Puzzle Numerical Ability

Use substitution to solve each system of equations. If the system does not have exactly one solution, state whether it has no solution or infinitely many solutions.

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Hi I previously asked this question, however I had made a mistake, the question is
How do you Find all values of k so that {{{ t^2+kt-8 }}} can be factored using integers? Evaluate 2m-5n/n+3p

if m = -2, n = 4, and p = -1.