exam Maths Puzzle Numerical Ability

what is the domain and range of these (1,2)(3,4) (5,6) (7,8) (9,13) well is it a function state range or domain

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exam Other Question

Solve for x:
logbase5 (sqrt2x^2-3)=3/2
Solve the system by addition.

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