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Math·Algebra·Linear equations in two variables

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One side of an isosceles triangle has a length of $x$ units, and the congruent sides of the triangle have a length of $y$ units, where $x$ is not equal to $y$. The perimeter of the triangle is 38 units. Which of the following equations best represents this situation?

A

$2(x+y)=38$

B

$x+2y=38$

C

$2x+y=38$

D

$\frac{1}{2}xy=38$