book Maths Puzzle Numerical Ability

(-3)+(-5)= the answers are...8,-2,-8,or 2 (thank you)

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book Other Question

I am supposed to find the value of x and y and do not know where to start. Here is the problem:

x-4y+22
2x+5y=-21 Can someone help me solve this for X
sqrtx+7 = x+1