Question

find the value of x in each case.
plz explain in detail ​

Answer 1

Step-by-step explanation:

3x+180-7x+80=180

4x=80

x=20°

Answer 2

Answer:

20°

Step-by-step explanation:

the angle beside the 100° angle = 180° -100°=80°

we know that the sum of two interior angles= the exterior angle.

this implies, 80°+3x°= 7x°

or, 4x°=80°

therefore, X= 20°