Question

find value of x in each case​

Answer 1

Hey mate!

___________________☆

Here is your answer:

7x+angle BCA =180° {linear pair}

angle BCA=180°-7x° -------(1)

100°+angle BAC=180° {linear pair}

angle BAC=180°- 100°

angle BAC=80° ----------(2)

Now, angle BAC+angle BCA+3x°=180° {Angle Sum Property}

So, 80°+180°-7x°+3x°=180°

260°-4x°=180°

-4x°=180°-260°

-4x°=-180°

4x°=180°

x°=180/4

x°=45°

____________________☆

Hope it helped^_^