Answer:
74 ba 'yan?
4x-2y+74= 180
use the addition property of equality;
4x-2y+74-180= 0
4x-2y-106= 0
as u can see they have a common number which is 2
4x-2y-106= 0
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2
2x-y-53= 0
let x= 0
2(0)-y-53= 0
-y-53= 0
-y= 53
-1(-y= 53)-1
y= -53
let y=0
2x-0-53= 0
2x= 53
x= 53/2
this ordered pairs satisfies the expression, u can use any of them they just got the same result;
(53/2,0) & (0,-53)
substitute each order pair to this expression (4x-2y), then u'll get the value 106°.
that figure is a supplementary, and supplementary angles measures a 180°, so 74° plus 106° is 180°.
