Question

find by substitutional method x+y=4,x-y=4

Answer 1

Given,
$x + y = 4 - - - - - 1\\ x - y = 4 - - - - - 2 \\ = > x = 4 + y$
Putting this value in eq. 1,
$\: \: \: \: \: \: x + y = 4 \\ = > (4 + y) + y = 4 \\ = > 4 + 2y = 4 \\ = > 2y = 4 - 4 = 0 \\ = > y = \frac{0}{2} = 0.$
Putting this value in eq. 2,
$x = 4.$



Hope this will help you. 

If you like my answer
Please mark it as brainliest 
And 
Be my follower if possible.

Answer 2

Hi!!!!
it's your answer!!!!



x+y=4 = x-y=4
x+x=4 = -y-y=4
2x=4 = -2y=4
x=4/2 = y=4/-2
x=2 = y=-2
LHS = RHS


hence, verified



hope it's help you .
please mark on brainleast.