book Maths Puzzle Numerical Ability

please help it say use the substitution method to solve the linear system

x+2y=-5
4x-3y=2


32-2y=4
x+ 3y=5


3x+y= -2
x+3y=2

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book Other Question

1/6+3n=7/24+n how do you change 3 5/8 into a improper fraction? Stuck on homework thanks