exam Maths Puzzle Numerical Ability

8.3 #16
Solve by substitution
Mcgraw Hill 6th editon,
Thank you for your time!!

5x-2y= -5
y-5x=3

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exam Other Question

Find the mean.
1, 2, 9, 10, 13
For the following set, which number has the largest absoute value?

4, -1, 12, -25, 17, 0