exam Maths Puzzle Numerical Ability

The area of a parallelogram is 24.96 cm squared. The base is 6.4 cm. If the measures of the base and height are each doubles, find the area of the resulting parallelogram.

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Can someone help me with the problem below, thanks.
Six distinct points lie on the circumference of a circle. How many inscribed quadrilaterals can be drawn having four of these points as vertices?
Thanks again. How would I solve the following system of by graphing, and what would the coordinates be?
3x + y = 6
3x - y = 0