exam Maths Puzzle Numerical Ability

Solve the system of equations by graphing. Then classify the system as consistent or inconsistent; and the equations as dependent or independent.

x+y=10
x-y=-6
Will someone p

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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 Solve for angle θ to the nearest degree, 0 degrees <(or equal to)θ < (or equal to) 90 degrees

a) sin θ = 1/2
b) tan θ = square root 3
b) cos θ = 0.253