Question

For a Supplementary angle, what is THE VALUE OF X in this problem:
(4x + 40)degrees and 3x

Answer 1

a supplementary angle means two angles that equal 180°

4x + 40 + 3x = 180

7x + 40 = 180
-40 -40
----------------
7x = 140 140 ÷ 7 = 20

Answer 2

if you add it all together it will be 180 so to work it out you would do this...
7x+40=180
7x=140
x=20

hope this helps :)