Question

solve it with methods

Answer 1

1)this is a straight line so angle DCB + angle BCA is equals to 180 degree .
y+130=180
y=50
In triangle ACB angle X + angle Y + 70 degree is equal to 180 degree that is angle sum property so
x+y+70=180
50+70+x=180
120+x=180
x=60 degree *ANS
2)

Answer 2

(i) 130 = 70+x;
( exterior angle= sum of two opp. angles);
so,x= 130-70;
x=60;
now,
x+ 70 +y =180;
60+70+y=180;
y= 180-130;
y=60;
second part is not clear send it again...