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A library has (58) books of two types, and the first type is (12) more than the second. What will be the graphical solution?

Answer and explanation

Correct answer: ((35,23))

The direct answer is option A, (35,23), where x is the number of first-type books and y is the number of second-type books. “Total 58” gives x+y=58. “The first type is 12 more” gives x-y=12. Add the equations: 2x=70, so x=35. Substitute into x+y=58: 35+y=58, hence y=23. Thus the graphical intersection is (35,23). Option A works: 35+23=58 and 35-23=12. Option B, (23,35), reverses the types; its difference is -12. Option C, (34,24), has the correct total 58 but difference 10, not 12. Option D, (36,22), also totals 58 but difference 14. A graph would show the two lines x+y=58 and x-y=12 meeting at the answer point. Memory cue: define the larger quantity as x, then use x-y=the stated difference.

Related tags

Graphical MethodWord ProblemIntersectionApplication

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