book Maths Puzzle Numerical Ability

x-y=2
4x-3y=11
How do I solve the sytem of equation using the subsitution method? Please show the work!

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book Other Question

5 feet 2 inches=how many centimeters
and
65 kgs =how many pounds
give conversation unit also wHAT IS THE FORMULA TO FIGURE OUT 35 IS 65% OF WHAT NUMBER? THANK YOU