Question

Please Help Me How to do this..

Answer 1

It is

They each have a right angle and they share an angle (the one in the right corner)

This means that they share 2 angles and therefore share all angles

edit: pt2

$\frac{x}{10+4} =\frac{3}{4}$

$\frac{x}{14}(times2) = \frac{3}{4}(times7)$

$\frac{2x}{28} = \frac{21}{28}$

2x = 21
x=10.5



$\frac{y}{14}(times2)= \frac{5}{4}(times7)$

$\frac{2y}{28} = \frac{35}{28}$

2y=35
y=17.5