now, let's take a peek at the legs AB and AC, they both have a tickmark, meaning AB = AC, so we have an isosceles triangle with twin sides.
and twin sides will make twin angles at the "base", namely 25 = 5x.
since we know then a triangle has a total of 180° for interior angles, and we also know that ∡B = ∡C = 25°, so 25+25 = 50, so whatever the ∡A is, 180 - 50 = 130°.
[tex]\bf 3y+70=130\implies 3y=60\implies y=\cfrac{60}{3}\implies y=20[/tex]
