exam Maths Puzzle Numerical Ability

How do you determine the (2,2), (1,4), (3,6), (-1,2) are function, domain or range?

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exam Other Question

Find the slope.
-6x - 9y = 12
Solve the following 2 x 2 systems using substitutions

5x + 2y = 29
4x + 3y = 33