Question

From the figure, if y = 400 then find the value of x .

Answer 1

i think its 70°
y=40
180 (angles in a straight line)
180-40=140
140 / 2
=70

Answer 2

70°

Solution,

y=40°

now,

`2x + y = 180( \: sum \: of \: angle \: in \: straight \: line) \\ or \: 2x + 40 = 180 \\ or \: 2x = 180 - 40 \\ or \: 2x = 140 \\ or \: x = (140)/(2) \\ x = 70 \: degree`

Hope this helps...

Good luck on your assignment...