Question

2(20-y + 20 - x) =100​

Answer 1

Answer:

40-2y+40-2x=100

80-2y-2x=100

-2y-2x=100-80

-2(y+x)=20

x+y=20/2

x+y=10

now, x=10-y or y=10-x

Answer 2

Answer:

=2(20-y+20-x)=100

=40-2y+40-2x)=100

=80-4yx=100

=-4yx=100-80

=20

= -yx=20÷4

=5

A=> -5