exam Maths Puzzle Numerical Ability

Write a solutionset for y=3abs(7-2x)+5 when y<8.

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exam Other Question

Please solve the simltaneous equations 8logx base 9 - 9logy base 27=8 and logx base 3 + 8logy base 8=13

im really stuck on this question!!
what is the difference between the commutative and the associative properties