From the first triangle,\(x+y+90 = 180 => x+y = 90\)
From the second triangle,\((180 - b) + x + 10 + y + 5 = 180\)
Since\(x + y = 90, 180 + 10 + 5 + 90 - b = 180 => b = 105\)
We have been asked to find the value of a(in terms of b and y)
Since the sum of angles in a line is 180,\(a+y = 180\)
Therefore\(a = 180 - y = 105 + 75 - y = b - y + 75\)(Option E)
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From the second triangle,\((180 - b) + x + 10 + y + 5 = 180\)
Since\(x + y = 90, 180 + 10 + 5 + 90 - b = 180 => b = 105\)
We have been asked to find the value of a(in terms of b and y)
Since the sum of angles in a line is 180,\(a+y = 180\)
Therefore\(a = 180 - y = 105 + 75 - y = b - y + 75\)(Option E)
...
