Question

X+y=4
x= -3
pls explain how to get the answer

Answer 1

See below.

Explanation:

x+y=4

x= -3

There isn't enough information to decide that x = - 3. We need to know y in order to find x. x is only -3 if y is 7:

x+y=4

-3+y=4

y = 7