Question

Find y.Simplify completely.

9
10
y =
= √ [?]
y

Answer 1

when running a line, in a right-triangle, from the 90° angle perpendicular to its opposite side, we will end up with three similar triangles, one Small, one Medium and a containing Large one. Check the picture below.

`\cfrac{19}{y}=\cfrac{y}{10}\implies 190=y^2\implies √(190)=y`

Answer 2

its either 10 or 90 but i think its 10