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Advanced Math / Nonlinear equations in one variable and systems of equations in two variables Difficulty: Easy

x=49

y=x+9

The graphs of the given equations intersect at the point x,y in the xy-plane. What is the value of y ?

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Explanation

Choice A is correct. It's given that the graphs of the given equations intersect at the point x,y in the xy-plane. It follows that x,y represents a solution to the system consisting of the given equations. The first equation given is x = 49 . Substituting 49 for x in the second equation given, y = x + 9 , yields y=49+9, which is equivalent to y=7+9, or y=16. It follows that the graphs of the given equations intersect at the point 49,16. Therefore, the value of y is 16 .

Choice B is incorrect and may result from conceptual or calculation errors.

Choice C is incorrect and may result from conceptual or calculation errors.

Choice D is incorrect and may result from conceptual or calculation errors.