Question

x + y = 4

x = 3

then y = ??

Answer 1

$x + y = 4 \\ \\ on \: putting \: x = 3 \\ \\ \\ 3 + y = 4 \\ \: \: \: \: \: \: \: \: y = 4 - 3 \\ \: \: \: \: \: \: \: \: y = 1$


$.............hope \: it \: helps.............$

Answer 2

Hey friend...!! here's your answer
_________________________

x + y = 4

x = 3


Put the value of x in equation

3 + y = 4
y = 4 - 3
y = 1

So that the value if y is 1

____________
#Hope its help