How do I figure out the following: If xy=546 and x+y=26, then what are x and y?

Asked on by callayne

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samhouston | Middle School Teacher | (Level 1) Associate Educator

Posted on

The easiest way is to graph both equations and locate the point(s) of intersection.  In this case, there are no points of intersection.  Therefore, this has no solution.

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atyourservice | Student, Grade 11 | (Level 3) Valedictorian

Posted on

I graphed it since i kept getting confused at my math and there are no real solutions

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callayne | Student, Undergraduate | eNotes Newbie

Posted on

Thanks for the help, people.  The 2nd answer is more advanced than where we are right now.  We're supposed to be using the ac method or, if that doesn't work evenly, then we're supposed to use a factoring method.

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gs01 | Student, Undergraduate | (Level 1) eNoter

Posted on

Since x+y = 26 ...........(1),

 and xy = 546.............(2)

x = 26-y

therefore substituting the value of x in equation 2

(26-y)y = 546

26Y - y^2 = 546  Taking all the numbers on the right side

Y^2 -26Y +546 = 0

Since it is a quadratic or 2nd degree eauation we will have two values for Y using equation for ax^2+ bx+c =


(b+and -(Sqrt(b^2-4ac)/2a)

-26+Sqrt(26^2-4*1*546)/2*1) and -26-Sqrt(26^2-4*1*546)/2*1)

 Y= 13 + 19.41648783i or Y= 13 - 19.41648783i

i = sqrt (-1) is called the imaginary part.

and x = 26-Y


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