Question

3x−y=3​
x−y=4 substitution

Answer 1

$x - y = 4$
$y = x - 4$
put in
$3x - y = 3$
$3x - (x - 4) = 3$

$3x - x + 4 = 3$
$2x = 3 - 4$
x=-1/2
$- y = 1 \div 2 - 4$
$y = 7 / 2$

Answer 2

Here is your answer.....

3x= 3+y
x= 3+y/3. ........(1)
x-y=4. ..........(2)

Putting value of eq(1) in eq 2....
3+y/3-y=4
3+y-3y=4
3-2y=4
-2y=4-3
-2y=1
y= -1/2

Putting value of y in (2)
x=7/2...
Hope it helps ✌✌ Please mark it as brainliest......