exam Maths Puzzle Numerical Ability

Solve the system by addition.
x + y = 6
x - y = 4
no book, thanks so much for all you do!!!

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exam Other Question

The line passes through the points (-3,4) and (7,-2). I have

m=4-(-2)/-3-7 = 6/10 = 3/5 I need major help

solve each of the following quadiatic equations by completly the square.

x^2-6x-3=0

and 2x^2+10x+11=0

thanks a million