Question 900352
 <pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi
4x + y = 180   |Multiplying thru by 3
12x + 3y = 540
......
IF 3y = {{{5x + 30}}}
....
12x + 5x+30 = 540  |Substituting for y
  17x = 510
    x = 30
....
30,60,90 right Triangle