Respuesta :
Since it is a 90° angle it is equal to the sum of 6x° and 4x°, so 6+4=10 and the answer is the second one.
Adjacent angles on a straight line sum up to 180:
90 + 6x + 4x = 180
Combine like terms:
90 + 10x = 180
Subtract 90 from both sides:
10x = 90
Divide both sides by 10:
x = 9
Answer: 9
90 + 6x + 4x = 180
Combine like terms:
90 + 10x = 180
Subtract 90 from both sides:
10x = 90
Divide both sides by 10:
x = 9
Answer: 9