x + 7y = 180 - - - - - a
4x + 2y = 180 - - - - - - b
Multiple a by -2 and b by 7
-2x - 14y = - 360
28x +14y = 1260
Add the above equations:
26x = 900
The value of x is:
x = 900/26 = 34.6°
The value of y can be obtained by replacing the value of x in equation a
34.6 +7y = 180
7y = 180 - 35.6
y = 20.6°
Hope that helps you
