exam Maths Puzzle Numerical Ability

How do you solve this problem? I don't know how to find x and y. This problem is on page 40 in the Glencoe Geometry Practice Workbook.

Thank you.

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exam Other Question

The cost in millions of dollars for a company to manufacture x thousand automobiles is given by the function C(x)=4x^2-16x+32. Find the number of automobiles that must be produced Solve the following system of linear inequalities by graphing.
x - 2y >_ 4
x <_ 4