Explanation:
Purple: b is incorrect because 6x+8x-15 has to equal 180. By looking at the line in between the two angles you can tell the angles are not the same.
Green: a is incorrect because the two angles shown are vertical angles which means that they have the same angle measure, and in 4x-10= 2x+60 x is equal to 35 not 25 as suggested.
Blue. a is incorrect because the two angles have to be the same