book Maths Puzzle Numerical Ability

1) 3x-2y=4
2x-5y=21

2) 4x+5y=-5
3x+y=21

3) 3x+y=7
3x+y=10

I cannot find the solutions to these systems. PLEASE HELP! I have to have them due soon!

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book Other Question
Determine the interval over which f(x)= the absolute value x-4 - the absolute value x+5 is a constant function. -200=k+(-99)