exam Maths Puzzle Numerical Ability

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Problem:

Find a system of equations with (2, -4) as the solution.

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exam Other Question
A relatively quiet room has a background noise level of 32 decibels. How many times the hearing threshold intensity is the intensity of a relatively quiet room? solve for x and y using three different methods, substitution, addition and graphing x-y=12
2x+y=3



Substitution

x=y+12
2(y+12)+y=3
2y+24+y=3
3y=3
y=1