Question

If the difference between 2 supplementary angles is 40 then find the angles

Answer 1

let the angles be
$x \: and \: y$

$x - y = 40$
$x + y = 180$
solving we get
$2x = 220$
$x = 110$
then
$y = 70$

Answer 2

let the two angles be X and Y(X>Y).

X+Y=180° ---->(1)
X-Y=40 ---->(2)

from (1)-(2).
2Y=140
Y=70°
X+Y=180°
X+70°=180
X=110°

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