exam Maths Puzzle Numerical Ability

Solve the following 2 x 2 systems using substitutions
y= 2x + 8
3x + 2y + 30

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exam Other Question

Solve

e^(x) - 2 = 15e^(-x)
Determine the maximum and minimum value of the following set of numbers.

3, -36/7, -1, -2/3, 5/4, -5, 26/9