exam Maths Puzzle Numerical Ability

solve the following system by substitution
4x-12y=5
-x+3*y=-1

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exam Other Question

x/y + 1 // x/y - 1 expressed in lowest terms is ?? For the following set of data, test the hypothesis that the average is 10. Run a test of that hypothesis and present the conclusion.
x
8.9
9.7
10.3
8.5
10.4
9.3
9.8
7.1
10.6
11.1