Respostas

2014-05-30T15:12:16-03:00
X+ 20 = 4x + 30 
3x = -10
x = -10/3
2014-05-30T15:16:13-03:00
4x+30°+x+20°=180°
4x+x+30°+20°=180°
5x+50°=180°
5x=180°-50°
5x=130°
x=130°/5
x=26°

-----------------------------------------------------------------------------------------------------------------------

4x+30°
4.(26°)+30°
104°+30°
134°

------------------------------------------------------------------------------------------------------------------------

x+20°
26°+20°
46°

-------------------------------------------------------------------------------------------------------------------------

134°+46°=180°