$\"\"$ $\"\"$

The equation is “ $\"\"$ ”

According to subtraction property of equality: If a = b then a + c = b + c.

$\"\"$ (Subtract 4 from each side)

$\"\"$ (Additive inverse property: $\"\"$ )

$\"\"$ (Commutative property: a + b = b + a)

$\"\"$ (Subtract: $\"\"$ ) $\"\"$ \ \ $\"\"$ (Add y to each side)

$\"\"$ (Additive inverse property: $\"\"$ )

$\"\"$ (Additive identity property: $\"\"$ ) $\"\"$

The value of y is 3.