exam Maths Puzzle Numerical Ability

solve the system by substitution:

4x-4y=0
y=2x-5

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exam Other Question

Help evaluate the determinate? Please explain everything so I can comprehend this...please.

|1 -3 2 0|
|-3 -1 0 -2|
|2 1 3 1|
|2 0 -2 0 Give the center of the circle with equation x^2+2x+y^2+22=0
I�ve come up with the answer to be (-1,0) is this right?