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Algebra / Linear equations in two variables Difficulty: Easy

The graph shows the possible combinations of the number of pounds of tangerines and lemons that could be purchased for $dollar sign 18$ at a certain store. If Melvin purchased lemons and $4$ pounds of tangerines for a total of $dollar sign 18$ , how many pounds of lemons did he purchase?

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Explanation

Choice B is correct. It's given that the graph shows the possible combinations of the number of pounds of tangerines, $x$ , and the number of pounds of lemons, $y$ , that could be purchased for $dollar sign 18$ at a certain store. If Melvin purchased lemons and $4$ pounds of tangerines for a total of $dollar sign 18$ , the number of pounds of lemons he purchased is represented by the y-coordinate of the point on the graph where $x equals 4$ . For the graph shown, when $x equals 4$ , $y equals 10$ . Therefore, if Melvin purchased lemons and $4$ pounds of tangerines for a total of $dollar sign 18$ , then he purchased $10$ pounds of lemons.

Choice A is incorrect. This is the number of pounds of tangerines Melvin purchased if he purchased tangerines and $4$ pounds of lemons for a total of $dollar sign 18$ .

Choice C is incorrect. This is the number of pounds of lemons Melvin purchased if he purchased lemons and $2$ pounds of tangerines for a total of $dollar sign 18$ .

Choice D is incorrect. This is the number of pounds of lemons Melvin purchased if he purchased lemons and $1$ pound of tangerines for a total of $dollar sign 18$ .