Question

What is the value of y in the equation 4 + y = −3?

A: 7
B: 1
C: −1
D: −7

Answer 1

To solve for a variable, you must isolate it onto 1 side of the equal sign.
4 + y = -3
Simply subtract 4 on both sides to get:
y = -3 -4
-3-4 is -7 so:
y = -7

Answer 2

4 + y = -3
y = -3 - 4
y = -7 <==