Question

Given that y = 4x, work out the size of
angle x.
y
X

Answer 1

x = 36°

Explanation:

y and x lie on a straight line and are a linear pair , sum to 180° , that is

y + x = 180° ( substitute y = 4x into the equation )

4x + x = 180° , that is

5x = 180° ( divide both sides by 5 )

x = 36

That is angle x = 36°