I'm pretty sure the attachment down there can answer ur question! :D
X=15 its simple since there's base angles and straight angle
9,6^2+18,8^2=X^2
92,16+353,44=X^2
X^2=445,6
X=21
The answer is 126 degrees
equation for first figure=2x+y=2
equation for second figure= 4x-y=8
(use formula x/a+y/b=1)
where, a=x component and b= y component..