Triangle A is an isosceles with two angles of measure x degrees and one angle of measure y degrees
write an equation relating x and y
Since triangle A is isosceles, two of its angles are equal in measure. Let's call this common measure x. The remaining angle is y degrees.
The sum of the measures of the angles in a triangle is always 180 degrees.
So, we can write the equation:
x + x + y = 180