exam Maths Puzzle Numerical Ability

thanks, can you please help me solve this

x + 5y = 10
-2x - 10y = -20

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exam Other Question

The perimeter of a rectangle is 56cm. The width is 6cm less than the lenght. Find the width and the lenght find the zeroes of the function algebracilly. use any method.
F(x)=2x to the 2 power +11x+3