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Multiple Choice: Based on the relationships provided in the diagram, which of the equations below is correct? Justify your choice.

This is an isosceles triangle because it has two congruent sides.
In an isosceles triangles base angles are equal.

Triangle, with right side vertical, top right angle labeled, 4 x, + 2 degrees, bottom right angle labeled, 9 x, minus 3 degrees, each with 1 tick mark.