exam Maths Puzzle Numerical Ability

Determine the domain and range of the relation
{(-1,4), (1,7),(-5,3),(9,8),(11,-7)}

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exam Other Question

the length of an rectangle is fixed at 20 cm. what widths will make the perimiter greater than 86 cm? 6x+2y=7
y=2-3x
solve by substitution or another method