exam Maths Puzzle Numerical Ability

(11x + 3y) (x + 4y) =

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exam Other Question

Solve the system by system:
8x - 4y = 16
y = 2y - 4

This substitutions have gotten me confused, any help would be appreciated. Thanks find the center and radius of the circle x^2+y^2-2x+6y+1=0 sketch the graph