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A farmer has (42) plants of two types, and the first type is (8) more than the second. What will be the graphical solution?

Answer and explanation

Correct answer: ((25,17))

The direct answer is A: (25,17), where x is the first type and y is the second type. Total plants give x+y=42. The first type is 8 more, so x−y=8. Add the equations: 2x=50, hence x=25. Substitute into x+y=42: 25+y=42, so y=17. Therefore the graph intersection is (25,17). Option A is correct. Option B reverses the types: its total is 42, but the first coordinate is not 8 more than the second. Option C gives total 42 but difference 6, not 8. Option D gives total 42 but difference 10. The variable order matters in a word problem. Memory cue: define first type as x, second as y; “first is 8 more” becomes x−y=8.

Related tags

Graphical MethodWord ProblemIntersectionApplication

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