book Maths Puzzle Numerical Ability

How many solution does the linear system have?
1, [x+4y=9
[-2x+y=0
2, [-x+3y=3
[2x-6y=30
3, [-x+2y=16
[4x-8y=-64
Decide whether the ordered pair is a sol

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book Other Question

please explain how to evaluate this type of problem.
(5+3)/2+2 The answer choices are 2,4,6,8 You have to buy 100 animals with $100.00. Dogs-$10, Cats-$3, Mice-$.50 The total of animals have to equal 100, and the total of dollars have to equal $100. I have try so many possibilties. Pleassssssssseeeeeee Helllllllpppppp Meeee!!!!!