Answer:
x=31
Step-by-step explanation:
you just have to add the two equations to equal 180 because it's they're supplementary angles.
(25+x)+4x=180
25+x+4x=180
25+5x=180
5x=155
(25+x)+4x=180°
25+x+4x=180°
5x=180-25
x=155/5
x =31
